I think there are two different points being made here, which aren't mutually exclusive.
- It's totally fine to be introverted and not want to take part in "big" events and to find them tiring.
- Even if you find them tiring, it can be useful to be able to interact with others in ways you wouldn't choose to, and learning coping techniques/mechanisms to do that can help make that easier.
I've never been diagnosed with autism, but I meet quite a lot of the diagnostic criteria, and I suspect I might have been diagnosed if I was significantly younger than I am. Obviously it's possible that that's a misinterpretation of the information I have but it does inform my next points.
In particular I didn't find it super natural or obvious how to have conversations with people I don't know, and I still struggle to time saying things correctly in group conversations - I often struggle to find the gap. But I have a load of coping techniques that mean I e.g. plan conversation topics before going to an event if I'm particularly worried about who I am going to talk to, remember that most people like talking about themselves and if you can get them going on something they're interested in then that usually works.
The stage I find most difficult is when I sort of know someone, so I have exhausted the standard getting to know you conversations but don't reeeeallly know them well enough to just chat without much effort.
I also find it a lot easier to talk to people a few at a time than in large groups. When I went to conference recently I didn't know anyone and honestly it was a bit grim, I really had to steel myself to force myself to go and chat to people and it was knackering. But the conference was really good for my career and I had won a prize so while I could have not gone it would have raised eyebrows.
Now obviously, ultimately I could get a job as something where I really don't have to interact with people very often. But in reality I don't want my life to be limited by that. Lots of jobs have difficult bits and that for me is one of those difficult bits. It's not something I have to do super regularly and I wouldn't pick a career where it was, but to rule out all careers where things like that are necessary would be really limiting for me.
Now that's all me, and OP's daughter may feel differently, but as a rule I think it's a parent's job to teach their kids the skills they need to get on as well as possible. And that might be going "okay, well parties where you don't know anyone are exhausting and you might not enjoy it but sometimes if we want to meet new people it can be a good way of doing it, so here are some techniques" or whatever. Not making her feel bad for not enjoying it, but also recognising that the world we live in isn't going to change any time soon and having coping techniques for going to conferences/making small talk before interviews/getting through the painful stage before you properly know someone can be really useful and can improve your life.