If you are filing separately due to the Income Based Repayment reduction then if she is under the filing requirement AND she has no fed/state withholding to get back then she has no reason to file HOWEVER she may want to file because the student loan folks may want to see it.
If you are not using the downloaded TT program where you can complete a second return for free then may I suggest you try one of the IRS FREE FILE options here : https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
