Yes, your daughter in law can sign the return because she has been named the executor.
The refund can be claimed by her if you file a Form 1310 with the tax return.
Theoretically this return can e-filed, but in practice decedent returns are frequently rejected for e-file because the Social Security number is flagged as belonging to a deceased person. I would try, but don't be surprised if the return is rejected and you have to print and mail it.
As far as preparing the return, it is more or less the same as you filing your own taxes.
On the screen titled, Your personal info look for the question, "I'm preparing this return for a Taxpayer, who has passed away." Once you answer that Yes, you will be asked for the date.
You will be prompted to complete a Form 1310 to claim the refund. The program will let you know if you need to attach any documents to the return.
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