Her friends were there and they are all really social but random and weird.
Maybe I picture them wrong but the way it sounds to me, they could be the kind who doesn't care at all if you're not saying anything. As others said maybe it would be better to try to do things alone with her until you know her a bit better, but once you are comfortable with her alone, you should give another try with her friends.
If she kept contact with you and she invites you to hang out with her friends, she must like you, so stop worrying about talking and just try to relax... And if you're getting bored, you can try to engage a one on one conversation with her or one of her friends instead of trying to get involve in a conversation with more than one person, which I think is a lot more difficult.
I hope you're not as sad anymore as you were when you wrote this anyway. Good luck