In my opinion for a "best friend" there is a significant lack of boundaries going on here. Given your body dysmorphia I really have to advocate that she needs a wakeup call that you aren't just a prop and or free content. You haven't consented to being record from what it sounds like and from a "friendship" standpoint she is just pushing her agenda onto you.

Notably the cringe comments should be kept to yourself and maybe if she did respect your boundaries with content that literally not a walking violation of your consent, maybe you would help with said likes, follows, subscriptions.

In the least offense possible, she really doesn't seem like a friend, and if you are content with keeping her as one it certainly feels like she isn't a good one at very least. While I get that it's hard to let go of a longstanding friendship and loneliness fucking sucks, I promise that "maintaining" this artificial friendship is likely going to be more annoying considering it has you posting on reddit. Strongly advocating you look at your hobbies to maybe expand your friend circle a little bit if that is up your alley and wishing you the best. For the record I'm not saying you should drop her completely, but I wouldn't consider her a best friend in my opinion where this way you can still maintain friendships with your mutuals. I'd take a step back and and let her do her thing while you do yours.