How much is the cost to seek whether or you have a case or not?

Was previously POA for family member. This member gave gifts to my husband, three years ago and he passed away two years ago. The items she wants returned, does she have a right to do so? She cancelled my POA stating only that I abused her account, which I admit I used, but not abusively, and she knew I did so. I have no problem returning things to her but a lawn mower she gave to him as a gift and I have a personal attraction to it as it was his last gift. (He became very sick with cancer and passed away.) I have until 11/15 to make a movement and really, want nothing to do with her or her family. Do I need to seek representation to send letter? I don't know if she will follow through with "civil and criminal charge filing.