Oh what a cutie pie!! She's got such a sweet little face!
If the other dogs are gentle with her, let them play a little bit supervised. The big dogs will need to learn how to interact with her, and she'll surprize you with how tough she can be. Billi is half the size as our other dog, Martini and she charges and pounces on her all the time. Of course Teeny knows to be gentle, but you get what I'm saying...
She'll be fine, you might need some anxiety medication in the mean time tho!