My (25m) gf (23f) is not interested in anything of value: only trash TV (no movies or series), doomscrolling and garbage music

Hello everyone.

My girlfriend and I have been together for almost 4 years. Things are generally good; there is, however, a feeling I would like to share.

I don't know what's the right way to word this... I feel like she has been getting progressively more "stale" (pardon me if this is too harsh: English is not my first language). When I met her, she liked to dance, read books, and seemed to show interest in all sorts of things. I loved to listen to her talk about these things. But now, she doesn't seem to care about anything at all. She stopped dancing, stopped reading, and sometimes watches movies with me only to make me happy (she clearly doesn't enjoy them). Now all she does is scroll Instagram and watch trash TV programs (I'm talking like, actual brainrot). She does not seem to like to talk about anything other than gossip. I believe she is being influenced by her friends, who I must say are pretty shallow. She never wants to learn anything new, find out about things, even the most random stuff. The few times I've tried to suggest her a movie or a band, she just didn't care about it, because it's not the stuff her friends like (i.e. some Taylor Swift-type of garbage).

Apart from this, she is really a great and caring girlfriend.

What do you think?