I guess I heavily disagree with both of your takes on this.
Ami wasn't pushing Ayane away. Ayane pushed Ami away by not only sleeping with Ami's uncle behind her back, but also with the reset stuff, and then pushed Ami away even more after Maya scared her.
Even before all of that, Ayane said crap like this on Ami's birthday:
Ami and Ayane literally formed the Sensei Love Squad, and Ami being
Ami isn't anything new. She didn't seem to do anything to change their friendship. Ayane did (and Maya). I'm not sure where Ami pushing Ayane away in chapter 3 comes from, tbh. She was trying to rekindle their friendship.
Frankly, even Ayane's problems with Maya and Sensei are her own fault. She treated Maya as a threat before making it to the roof, and basically spent years harassing Sensei while Maya had to hide their relationship. Ayane was even the one who pushed for a sexual relationship with Sensei, surely knowing it'd at least change her relationships with Ami and Sensei. It, of course, is also something Maya likely hated, like how she hated Ayane flaunting her relationship with Sensei during the resets:
Ayane's actions are a large part of why her relationships are the way they are. I'm curious if she may have even played a part in why her father neglects her and her mother abandoned her, but I'm trying to give her the benefit of the doubt.
Anyway, all that you showed of Ami is after Ayane messed up their friendship, slept with her uncle, acted way different than usual, bullied her, and was just implying that she was somehow involved in Sensei breaking and being incapacitated for 2 months. On top of this, Ami was apparently finally breaking after all of the years of crap she's been put through by everyone around her. Hence why Ami has short hair now.
But the power imbalance I'm referring to was shown blatantly in Ayane's Chapter 3 'Double Jeopardy' Event:
How someone could consider this as them being "equal" is beyond me.
Ayane definitely played a part in Ami's recent breaking, and it's likely why she wishes she had a friend she could trust:
I'd be curious how Ami is going to react to Ayane now, but it'd probably be more of the same. Ami seems even more submissive now.