No, she cannot cancel a return she just e-filed. E-filing is like dropping an envelope in a U.S. mailbox --- you cannot get it back. If the e-file is rejected she can change it and re-file. If it is accepted, then she has to wait and amend it later to change the way she answered the question about whether she could be claimed as someone else's dependent.
You will have to file your own return that claims her as a dependent by mail. You have been blocked from e-filing with her SSN on your return for this year, no matter how long you wait for her to amend. Print, sign and mail your own return.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
