I started an amended return just to see what would happen if I didn't claim my child. I cancelled without saving it, but this change stuck. How do I "undo" this change?

I do want to file an amended return. I received a 1099-INT for $34 after I filed, and I now owe (only my state) $2. I want to file an amended return mostly because someone else may try to claim the same child, and I want to make sure that my return is 100% solid. So, when I cancelled my amended return after seeing what the effect of removing my dependent, Turbo Tax remembered this change. Now, when I try to add my child back in it tells me that I owe the IRS because someone else claimed her (which was me back in January). Any ideas? I think I may need to call TurboTax if I can figure out how.