Is a person who supports the love of the person she/he loves included in the NTR fetish 🤔?
Aherm, resident hentai coomer here to answer your question.
The closest term to this scenario is netorase, which is really just a fancy way to say cuck who likes to watch their beloved get together with another.
But in this case, she is not a true cuck, cause she hates it to her core. She is trying to force herself to be a cuck, but it's not working out for her at all.