I think she was getting too colse to Ram and Ram's step mom did her own little Magic to separate them. remember she said she was the reason Ram didnt marry in his 30s?...i think she seperated them with either lies or exposing the girl's truth so Ram will leave her. Because the girl was too much for her to handle, SHE DIDNT LET THEM MARRY..
It's good for us, because now Ram will have his own wife...his true love(Priya).