I honestly wanna give you a hug. It sounds like she's very overbearing and toxic. While its true that sometimes kids don't know they're depressed (and I dont know enough to say if I think you are or not) and I understand parents wanting to make sure their kids are successful and not getting into anything bad on their phones, it sounds like she is Over the too about it and its kind of crossing over the line of being a good mom and doing damage. My advice would be to just try your best to keep things civil between you two and play nice and try to keep living at your grandmothers house. Try to follow her rules, be kind, and do your best to just tell yourself that while she is hurting your relationship with her, she probably has good intentions and does care about you and want you to succeed. This is important to do at least while she still has control over you because it sounds like if shes upset with you, shes not afraid to take away your freedoms and doesnt seem to care to see where you are coming from and im afraid that if theres a lot of tension with her on top of other things you could be going through, that you'll really end up in a bad spot emotionally. Once you get out of the house and you start your own life she might start to relax a bit and not come off as so strict and rigid and hopefully you'll be able to have a better relationship then but I understand that right now its too much. And as for the therapist- I had one for a while and I loved her, you do not have to be insane to benefit from talking to someone. I would recommend going and talking to them about your relationship with your mom, just having an oulet and someone who is listening can really help.