H1B Transfer or H1 B Activate

[ravismile]

Hello - Looking for some guidance. My spouse has H1B with Employer A but never changed from H4 to H1B. Now it's already expired. In meanwhile I applied for H4 EAD and she got job on it from Employer B. Due to my extension and delay in processing. Now is it possible my spouse H1 B transfer from Employer A to Employer B though it is expired? She has few years of term to Max out. 

[gopalakrishnach]

Did Employer A did not revoke H1B after she did not join and start working for them ?