Several things to think about:
1. I don't know about VT laws, but in New York, you would need a permit to legally keep a wild white-footed mouse in captivity, as they are a native species. To be honest, it's unlikely anyone would find out if you were illegally keeping a wild mouse, but I have to suggest you check out your state's laws on the matter. Without knowing the background info on where this mouse came from, I won't comment on whether she should have been released.
2. Let's say you disregard the laws. Has this mouse been to a vet? It's unlikely she has hanta, lepto, or anything else too serious (if she did, at this point, you'd probably be sick). But what about internal or external parasites? They might not be immediately evident.
3. It took me about a year to introduce my wild rat, Beatrice, to a domestic cagemate, Imogene. It was VERY hard on Imogene, and the ability to socialize with another rat seems to make little difference to Beatrice. She can be very rough with Imogene, although they do live together peacefully now, if I could go back and do things differently, I think I'd have left Beatrice by herself. Although I have heard of a case where a wild mouse and domestic mice lived together, it's not something I'm going to recommend trying.
4. In terms of taming, your wild mouse will always be a WILD mouse. Beatrice is "tame" and trusts me, but she is still a VERY different sort of animal than any domestic rat I've had. There are some aspects of their behavior you just can't change. *looks at scarred fingers*