How do I claim this deduction when amending a return?

I just filed my mom's taxes using TurboTax online, and the return was accepted by the feds.

The problem is I just realized there's a major expense we should have claimed:

Specifically, we put a new roof on our home. A bit of Googling indicates a new roof is considered an improvement, as opposed to a repair.

And because it's an improvement, that means it qualifies for a tax deduction.

Unfortunately, when we log in and click "amend (change) return," there's no clear way to claim this deduction.

I click on the thing that brings us to a screen that says, "Your tax breaks," then we click "Your home," and it shows the following categories:

 
Mortgage Interest and Refinancing (Form 1098)
 
Property (Real Estate) Taxes
 
Home Energy Credits
 
Mortgage Interest Credit Certificate
 
2008 Homebuyer Credit Repayment
 
D.C. First-Time Homebuyer Credit

But there's no category for declaring a home improvement expense.

Note mom took the standard deduction, as opposed to doing itemized deductions.

How should we proceed?

Thank you!