SIL stole from us at baby shower.

This happened a few weeks ago but I have to get it off my chest. Baby shower was a few weeks ago and we just discovered a bunch of stuff missing from our basement. A bunch of PS3 accessories and games are gone as well as some iPad accessories of our son's. Immediately our son said it was his aunt because he saw her going through our stuff. She's a drug addict, loser, in and out of prison. Somebody also told me they saw her going through all the gifts in the baby room during the party. I'm just so disgusted. My husband keeps trying to give her chances and she does stuff like this. He confronted her and she said she might have borrowed some video games but doesn't remember. Sure. Needless to say, she is not allowed in our house again but I'm sure my husband will cave since she's his baby sister and invite her over again. I wish I could protect our family from her and people like her.