IS filing by mail going to fix my problem

[oisgen19]

MY dependent also filed her owned tax claiming a personal exemption

[DawnC0 · Accepted solution]

Yes, if you want to claim a dependent that has already been claimed, you will need to select File by Mail as your filing method; you won't be able to e-file.     https://ttlc.intuit.com/replies/3401713

She should file an amended return to indicate she is claimed on another return, but you will still need to file by mail.