if she got a w-2 for the 1200 with no withholding and no other income she would not have to file a return.
the only way to get back withholding is for her to file a return, but you have to consider the cost of filing vs the refund she would get.
if she got a 1099-NEC for the 1200 she will have to file because she will owe self-employment tax if the net after subtracting expenses related to the $1200 is more than $400.
in either case nothing prevents you from claiming her as a dependent. in fact, she must mark her return, if filed, that she can be claimed as a dependent. failure to do this will cause e-filing problems for either you or her.
