H1b Revoked while H1b transfer in progress

Hi,

My wife came to USA in h4b visa and she got her h1b approved from employer A and she transfered h1b to employer B now employer C is ready to hire her for full time and applied for h1b transfer, employer B aware of full time opportunity and no concerns of transfer what so ever. But they are stating that they would revoke her H1B the moment she let them know the last day of employment with Employer B. We would like to know if she be eligible to work with Employer C with USCIS transfer receipt…

By the by, she is always in a legal status…she is never on the bench during her H1…

She can join C just on the basis of transfer receipt. If B’s petition is withdrawn, it won’t impact her transfer process.