Chapter 116

In which chapter did they confirm she has feelings for the queen?

It's hinted! If you look back at the old chapters you'd see that Karen was copying Abigail's way of questioning (like pretending she was talking about her friend but in reality she was talking about herself) style, And she asked her what she thought about same sex relationships as a feigned question and when Abigail said gender doesn't matter she(Karen) was thinking deeply about it then asked "What if one's older than the other?" And Abigail said "well they'd have to wait until the younger one/17 years old was atleast an adult" and Karen had a thought of 'I'll have to wait a bit longer then' plus, in the chapters 116+ she's hesitating on asking her father if it's alright for same sex relationships and she looks jealous of the mermaid who likes the queen because it's hinted she has feelings for Abigail