Poor Molly

I hope that she won't do that again!
I'd say let her get it all out, and then when she's down to dry heaving and nothing more is coming up, feed her some boiled chicken and white rice. If she holds that down, she'll probably be okay. If the vomiting doesn't stop and she can't hold anything down, you should take her to the vet right away.
Did she eat the kitty litter too?

I don't know how harmful that stuff is, but I'm sure if you call the vet they'll tell you what to do.
I hope she feels better