Axe ghost didn't know she could see it. So it chopped into her to check for ghosts, but not her. Same thing when Miko stepped into the chain ghost to protect Hana from contacting it (before she knew Hana has a super aura).

That acknowledgement of being seen changes them very quickly to much more menacing behavior. Like granting them permission to interact. She's been safe so far because she keeps convincing them that they were mistaken.