Please know that I actually know several people who have gotten into medical school via "connections" despite what a lot of people hope isn't real. However, if your faculty member is not comfortable with it given her status or moral compass, then that's that.. afterall, a note of support is not part of the "standard" things an applicant is allowed to do post II: send additional LOR, send LOI, send updates, etc. besides, every med school, faculty members, admissions committee is different. i'm not talking based on facts, just personal experience and offering my perspective. being waitlisted sucks, and I hope things work out for you.