I think she will forgive her. It might take Pallavi some time but also remember Pallavi never even asked her Amma if she is ok with her staying at D house. Also she never calls to ask how she is etc. Amma is a modern saas but Bahu should have some responsibility towards her too.
Amma went to invite her and Pallavi promised her. Yes she made it and had she said she had traffic or scooty trouble, even that would have been fine, but as soon as she said Mandhar ka haat jalgaya tha and she went to get doc etc and no one was home and making all these excuses, Amma realized that she was not even apologizing and she felt hurt and sad. Winning Amma and Raghav will be easy. As we see in precap, Pallavi looks worried about something and Raghav still cares for her and asks is everything ok....so i doubt there will be a big redemption situation, maybe a small sorry or not