I need to file a 1040-X for my Mom when she gets her refund as I neglected to check the box that I can claim her as a dependent. My return was rejected for this reason.

Because I tried to claim her. I filed both returns via e-file. My question is will i be able to e-file her 1040-X form?, and when can i re-file my return and can I e-file my return again? Thank you!