How can I claim school expenses for 18-yr old dependent that filed 1040EZ and didn't check box that someone else can claim her?

My 18 yr old daughter files a tax return to get withholdings back, made less than $6K last year, and checked the box that no one else could claim her. I paid $1,700 in college tuition and books for her and claimed it on my joint return with my wife. I got an error that I couldn't claim this because her SSN was already on file with her return claiming her personal exemption. How can I claim the $1,700?

The software is suggesting I delete her as a dependent so I don't get the deduction. How can I fix this?