A lot o things building up in this chapter, I think Asuka probably had a relationship with that girl that briefly appeared in her memories but she realized that she only liked her mom.
I was thinking that the girl who briefly appeared was someone who just used her for a bit and then dumped her when she was done and her absent-mindedness was due to being unable to process what happened to her. Her mother being there for her was probably the reason she now has feelings for her.
That's a really dumb interpretation. The girl has been gagga over her momma since she was a child, as has already been shown when her aunt turned into her enemy when she displayed interest in the mom.
A little rude to call my opinion dumb, but whatever. The reason that i had that "dumb" interpretation is because when asked when was the first time she realized she had romantic feelings for her mother, Asuka's mind goes back to what appears to a memory of having sex with a girl. If she has been in love with her mother since she was a child, i think something else would've popped up when asked that question. Anyways, now that i think about it after re-reading the chapter, it seems possible that she was the one using the other girl in hopes of forgetting about her "unnatural" feelings for the mother.
I said dumb because it reduces the whole love aspect to psychological trauma, which irritated me. Sorry. Anyways, my take is that she realized her feelings for her mom after being involved with that unknown girl simply because that's when she awakened sexually, so to speak. So she knew then what to associate the feelings she had with.
I'll say that you both are right because yes Asuka was in love of her mother since a child but since the moment she was in contact with another girl, she realice that she want's to has sex with her mother.
In another words I'm trying to say that Asuka has a such big problem, all her life burning in flames by the love that she feel by her mom. she may end up burned if she continues like that. See this is the chapter that follows, the situation between them gets sad.
https://fantia.jp/posts/59990
