The short answer is go for it! I think everyone is nervous on these kind of trips but you will soon wonder why.
If you have already camped with her, you will be fine
- you know what you are doing and people are willing to give you hand with your tent if you need it. My child was a bit older when we did our first ever camping trip, which was this one. I used to settle her on a picnic blanket with some snacks, while I pitched the tent. Could you leave your daughter strapped in her car seat or pushchair, if you are worried about her doing a runner?
Its a pretty big trip - I think about 60 pitches (sure Bill will be along to confirm or deny shortly). SWK uses a separate area - which is really nice as you know everyone is in the same situation as you and I have no problem saying hi to random strangers! The kids make friends, you make friends.
No organised group activities other than the music in the evening. But people do naturally get together for frying pan tennis/football/kids sharing paddling pools/communal meals. Peppa Pig world is not far - again some people car share. Just depends how social you want to be.
Hope to see you there.