Returns that were originally sent with free shipping

[scrappin*chick]

I recently sold a jacket that included free shipping to the buyer.  The description noted the measurements and the return comments indicated that it was returnable only if not as described.  The buyer sent a return request because the jacket doesnt fit.  I guess I'm ok with her returning it if she pays the return shipping, but can I deduct the original shipping from the amount she paid for the item?  Thanks for your input!