"I had never asked to see Paulina’s feed. I didn’t even know the name she used."
I think therein lies a big part of the problem. She's feeling rejected that her 15 year old daughter won't listen to her acoustic cover of some band from her generation, but then doesn't express interest in this huge part of her daughter's generation.
I don't have children so this is just armchair/backseat parenting which I understand is much easier from the sidelines. That being said, it seems very evident to me that it would probably help her tremendously if she would update herself with pop culture and technology a little bit to make herself a more accessible and relatable to her daughter, because playing music from yester-generation is only going to make herself seem more foreign and distant (in this particular scenario)