No your return will not affect Mom because she already filed and her return has been accepted. The problems occur when a dependent files first and says NO to the question about being a dependent----then the parent who tries to e-file gets rejected and has to file by mail.
If you said yes to the question about whether you can be claimed as a dependent then you should both be fine with no worries about amending.
**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.**
