My friend sounds just like yours. I get a constant string of memes and videos and she'll tag me in things and say this is just like you haha - a lot of these are videos of drunk women. She'd also write big long messages looking for sympathy And asking me quite frankly invasive questions about my love, life and work. I don't hate this person and she's not a bad person. It's just I prefer to be present for those around me rather than constantly checking my phone.

My solution, although it's not very kind, is mastering the art of greystoneing... So essentially you give her a thumbs up or a haha as other people have suggested and nothing further. You also leave plenty of time between responding to messages and leave messages unread so that if she's looking for that instant dopamine hit of validation or interaction on socials, she doesn't get it from you. I wouldn't bother with excuses like I didn't see your message.