It’s pretty clear that OP’s daughter does feel like she’s missing out on things her friends are doing, that’s why she is asking. Social isolation doesn’t have to be total to be damaging to your mental health, especially if you’re an extrovert.

And bringing up “but in my time…” Yeah, no. Not a comparable situation. If everyone is on social media and you’re not, you’re going to be left out of at least some things, there’s just no way around it.