Ultrasound pictures..

So my husband and I were showing my mother in law the ultrasound pictures and we told her she could have one of the pictures that says “baby” (because it was a duplicate). She did not take a duplicate and then when we brought it up she said well she already cut it out and we gave it to her so it was hers now. I’m really upset about it because I don’t need two of the same picture and they aren’t hers they are mine and my husbands. I’m honestly considering cutting one of the duplicates out and switching it when she’s not looking because there is no way she is going to give it to any other way.