At this point, the only option you have is to print and mail your return. The IRS will not accept another e-filed return with your dependent's social since she originally filed as not being a dependent of anyone else. Even though she has already sent the amended return, you still won't be able to e-file yours.
So if you plan to add her as a dependent, add her to your return and mail it. Once they process your return and her amended return, they will sort it all out. Amended returns can take up to 16 weeks to be processed. And your mailed return may take a while as well. You can start tracking yours 3 weeks after mailing it.
Whenever you mail a return, it always takes longer to process because it's added to a stack for an actual person to review/process. E-filed ones go through a computer system for processing, which is much quicker most times unless they are flagged for an error.
