Homewreck is the wrong word to use for the reasons you said. However, I feel like she's trying to forcefully change a relationship she has no part in for her own amusement. That is what I dislike about it. She is purposely trying to both inquire and mess with Rihito's and Noa's relationship which is frustrating to me.
That would be even worse. Thankfully it looks like she's gonna be on side character/wingwoman duty at most.
She is an interesting character, being the confident teaser (complete opposite of Noa). However, I just don't want her to force any changes between the two leads. I enjoy it more when they are learning how to process their relationship from each other. When I called her a home-wrecker, I was trying to get across that I dislike how she's adding friction in the relationship Noa and Rihito has. Not that she's a potential love interest.