Takes up to six weeks to process an amendment, since all work must be done by hand. Easiest course of action is to have her do her amendment Now, mail it in, and then you mail in your original return claiming her - at least a month from now. There is No point trying to file an extension for your return now - not accepted after 15 April. However, if you know you'll owe, you can make a payment on-line at IRS.gov; click on 'Pay'. While you're visiting IRS.gov, consider setting up an account there to track your returns/payments via their automated system. And don't be in a hurry to print your return for mailing; you might get a late 1099 or K-1 in the next few weeks ...
