Checked it but it looked like she did her job, she told Chihaya she can't stand on the chair putting up flyers with her skirt on, this seems reasonable as she might flash the guys. She basically told her that wearing the skirt on top of her track pants is unlady like so she shouldn't wear her skirt on top, sure Chihaya is a tomboy but the teacher trying to conform her to the set rules is hardly at fault for trying. Getting angry that she's taking of her track pants in the hallway, this is a school and she shouldn't take of her clothes in public in the first place also there's the flashing thing again. Complaining that she can only put up one flyer on the board like all the other clubs, Chihaya probably didn't intend to but she's at wrong here and if the teacher let her do that it'd mean she was treating her differently than others or playing favorites which is hardly fair and would have been wrong. Complaining that she's sleeping during class, again perfectly clear reason for complaining about her behavior. So which part shows that she's been a bitchy old lady?
From what I can see she's doing her job only difference is that she's strict on the set rules and Chihaya didn't follow them. Just so you know it's not a matter of Chihayas personality, the only thing that matters in this case is whether or not the things the teacher scolds her on are relevant or not and I can't see how they aren't. Maybe you can shed some light on that?
Please do show me exactly where she's ever been against Chihaya making a club because making Chihaya follow the proper procedures to create an official club hardly qualifies as being against her. Obviously she's seen how Chihaya acts and know a bit about her so making them change the president was a good move since Chihaya is oblivious to the things around her unlike Taichi. In fact when I looked at that episode again they did zoom in on what I'm expecting to be Chihayas name so to me it looked like she was thinking about whether Chihaya could fulfill the duties as president, obviously she figured Chihaya couldn't and I agree because the club would suffer if she was simply because of how strict they are on the rules.
In simple terms Chihaya would be closer to a student getting an assignment and only doing what she thought was the assignment yet if she read through it properly she'd notice that she missed a lot of details that are crucial to it and that's why she's not fit for the role while Taichi is. Another example would be Ritsu from K-ON but without a forgiving student council that's fine with her handing in the paperwork late etc, in other words they wouldn't be able to do anything because the person in charge doesn't really know what they're doing.
Also she had a choice when she accepted the club as an official one because she could have easily decided that they have to have an advisor before they can be an official club, that would be a clear example of getting in their way but she didn't instead she offered to be their advisor so that they got recognized right away. And as their advisor she could just as easily decided they weren't ready to participate in the tournament and withdrawn their application just by reasoning that it's to early as 2 of the members only played for 2-3 months, that would also be a clear example of being against Chihaya at every chance she gets but she didn't.
As for the compromise if she was really against it then she would have told her no and wouldn't have even bothered listening to her considering they weren't even an official club so the school didn't have any obligations towards this club what so ever. The mere fact that she did give an unofficial club a room no matter which room it was shows she compromised and it was fair giving her the storage room as it'd be unfair if she got a proper one when it wasn't official nor would it have been fair to the existing ones.
Again she's just a strict teacher and it feels appropriate instead of an older teacher letting every rulebreaking student get away with everything all while dotting on them. If you ask me it seemed more like she understood how serious Chihaya was about karuta and therefor gave her a chance to prove it because looking at her personality she wouldn't have any problems showing her the door when she asked for a room no matter how many times she asked. Seriously watch all those scenes again and ask yourself as a teacher does her actions make sense or does she just hate Chihaya, is there any truth in the things she tell her? Because if you don't see that she's doing her job right by not ignoring problems and yet still cuts Chihaya some slack then I'd like to know what you see.
Don't get me wrong though I like Chihaya but looking at it objectively the teacher simple hasn't been against her every step of the way nor tried to sabotage anything and she scolds every student breaking the rules and despite all that she still helped Chihaya far more than required.
Edit: Starting to feel like a troll everytime I post something here...