Have Been Bullied at school Advice please

So this girl was giving me dirty looks all the time because apparently she didn't want to be friends anymore and yeah she wouldn't stop my mom had said it was a form of bullying and stuff she's said a couple things even in the past she's put me down she's commented on my Auditory processing and Memory issues and I guess my advisor didn't realize how bad it was until he saw me and asked me if I was ok because I looked really sad and I nodded my head no and he came over to me I put my head down and started crying and it looked like he was worried because I usually tell him every problem since he's my advisor so he went to call my mom and figure out what was going on then my mom told him everything about the bullying because I had said it so many times and nobody is taking me seriously or believing me so he finally saw how bad it got and came over and was like no one gets bullied here and it's going to stop and yeah then he had a conversation with that girl then he asked me if I would be willing to go and have a conversation with her in the same room and I said yes but she did most of the talking she said that like a family member or something died around this time of year and she gets depressed an then we went upstairs she was crying but she always does after getting confronted about this stuff and she usually uses the family dying thing and me out of feeling bad for her thinking it was true at that time I don't know if it was or not I gave her a hug and she said i'm really sorry I wish I could of done things differently and I really don't want to lose you as a friend I said we can try being friends again but I feel like she'll do it again like always so I feel like I regret accepting her friend request and like sending her a text Hi and I regret all of that because I don't trust her I don't know what to do.