Rape attempt aside, I can see the new girl's only contribution would be the bite mark.
This might not even be a Ria thing, but rather Suzuka is going to see that bite mark and assume Ria was the one who marked him.
On the Ria side of things, I don't think we are seeing the full picture. It's not a surprise she became a model because of Haruka, but there is still a gap between Ria the shy girl who isn't comfortable with her body vs the Ria who became a model.
Still cant shake off the feeling how Ria and Haruka had mutual feelings in the past that was just put on hold.