Have a Tax Question? Ask a Tax Expert
Welcome to Just Answer. I am here to help you resolve your tax and finance concerns. Please feel free to ask anytime you need extra help.
Although you are not legally obligated to split the refund with her, you may find it practical to reach an agreement to give her some portion and let it be done with.
Perhaps the easiest way is to calculate your refund withhout claiming her and compare that refund to the actual refund you will receive. That is truly the portion applicable to her.