Congrats on your little one!! I can relate to the biting thing & rest assured that Mia will be find with kids and her biting will stop. Billi is about 19 weeks now- she was the same age as Mia when we got her & OMG her biting was out of control at first! Those teeth are like little razor blades!
What we did was make a high pitched "squeak", like "OUCH!" & then pull our hand away & quit playing for a few seconds. Then we'd put our hand back and if she bit again we'd pull away again. It didn't take more than a day or so for her to get the message and she's much, MUCH better now. And I'd fully trust her with kids now (though I don't trust kids with her, not unsupervised anyway). Try doing that with Mia and I'll bet she gets the message too! Good luck!