What sort of formal arrangement was made for Veronica to live with you in the first place? Was it a foster care arrangement? Was there a case worker monitoring Veronica's care, and is there a caseworker monitoring Veronica's care now?

If there is, you should contact them and make them aware of the changes that have been made--if not, or if you don't know, contact the people you work with at the Fresh Air Fund and let them know what is going on--they may be able to intervene on Veronica's behalf, or at least to steer you to an advocate of some sort that can--

Also, contact counselors at the middle school and tell them about what has happened, and about your concerns--they may be able to advocate or find an advocate for Veronica, if even half of what you say is true, she needs one--