Especially with COVID, that pretty much cuts her off from all of her friends, leaving her only able to talk with her parents and her younger brother who she can't relate to instead of venting out to her friend and cooling off.
Her school, extracurricular and free time with her social circle were already taken out from her and now the phone? And we all know whatever social life her friend circle has won't stop. She's just going to be left out. Once again.
I get that this is HN and a lot of people here probably didn't care to be left out (or convinced themselves they didn't).