First of all stop having any communication with her as she’s not your Mahram. We don’t keep “Friends” with opposite gender in Islam. This is a
trap of Satan to get you into haram through halal means.

I wanted to know some ways in which I could help my friend. She used to pray on time but since the last few months she has stopped doing so. She doesn’t have any control over her daily routine and is struggling to study. She is a really good student and I want her to pray on time regularly. How can I convince or influence or do something that will encourage her to do so?