<p>If I were the college, I'd honor the commitment made by the coach. He was speaking on behalf of the college at the time he made the offer. I think this constitutes a breach of promise, but I'm not a lawyer. Perhaps other posters with more legal knowledge can chip in here.
When was the offer made? When was it rescinded? Did your D send in an acceptance to the college and a housing deposit (if applicable)?
Depending on the time-frame, you could make a case that this breach of promise has prevented your D from pursuing other college options.</p>