Parenting advice needed. Stealing.

My husband has a nine year old daughter from a previous marriage. I have a seven year old daughter from a previous marriage. Over the summers and holidays, my husband’s daughter stays with us and the kids are spotty on getting along, during the summers the girls have a few weeks together before my daughter goes to her dads and then my husband’s daughter is here without my daughter for a couple more weeks before going back to her moms.

So the dilemma. My daughter is a saver.🤑 She has a big jar that was filled with coins, 1’s, 5’s, 10’s, and 20’s...she had around a $100 in bill’s in there. The money was all there before my daughter went to her dad’s, after she left my husband’s daughter spent hours of unsupervised time in my daughter’s room, playing with her toys and stuff, she trashed her room while my daughter was gone, throwing all her dirty clothes in there as well, but I digress.

After she went to her mom’s, I realized the jar of money looked light, I counted the bills and there were only $6 in 1’s left! I know his daughter took it, but he felt like since we didn’t catch her in the act of taking it, we couldn’t do anything. I totally disagreed.

So now it’s Christmas and the first time she’s been back since she stole my daughter’s money. I feel like it should’ve been addressed. I took her jar and hid it in my room, because again...my daughter is at her dad’s and I don’t want his daughter to steal again. But I just put a $20 in her jar that she got for Christmas from her grandpa and was reminded of the only $6 left and it bothered me all over again. I mentioned it to my husband and he wont say anything!!!

What would you do?