The relationship the two of them have makes Adelaide irritated in a way that she probably can't even begin to articulate, but Eva has really entertwined herself into Adelaide's life in a way Adelaide can't imagine disentangling. It'd be more difficult for Adelaide to live without Eva than vice versa, and Adelaide also loves Eva very much so it ends up making more sense from a love, pragmatic, and relationship standpoint even if she feels weird about it.
Part of her thinks Evangeline will grow up and decide she doesn't want to rely on mean frilly lady anymore. She wants this to happen but also Does Not for obvious reasons... But she doesn't understand Evangeline loves her for reasons that are beyond her 'societal' value as a partner.. She's slowly accepting it but can't wrap her head around why someone like Eva tolerates her...
So that is to say, don't worry too much. Eva has more cards over state of relationship and ending it is not on her mind!
Thanks for being interested in them also! I wasn't sure if anyone would like her.. Adelaide is a kind of character I've wanted to tackle for a bit and responses to her were about what I expected in some ways but I was surprised by the amount of people who understood and/or felt fondness towards her! My favorite variant are the people who understand her but dislike her anyways LOL. I hope to explore them more in a doujinshi.. Whenever I finish it!

Beautiful art from Kails