Low income, found large capital loss 1099 - refile?

Hi, I filed taxes for my newlywed daughter and husband. After filing, he gave me a 1099 showing a $7K capital loss due to stock sales. Their income was only $13K, so when I entered the 1099 there was no change in tax owed (really, refunded) and Turbo Tax desktop would not let me refile.

 

Do I need to refile to carry over the loss? The IRS already has the same 1099, submitted by Ameritrade. 
if yes, how do I do it in TT if it seems to not let me?

if no, then just manually enter the carry forward loss in next years return?

 

TYVM