My Addie vomits a sort of yellow-white bubbly bile (yucky), if she has been chewing on rawhide. It is not much, but the act of "messing inside" makes her very sad and guilty. It usually happens at night, several hours after chewing. Rawhide doesn't effect my other dog at all.

Getting a second opinion is definately the thing to do, but if she has rawhide, you may want to take it away for awhile. Her tummy may need a break.