What should I do?

I am the manager and buyer for a women's clothing boutique in a pretty upscale shopping mall. Almost two weeks ago I discovered that an employee who was always so great (or so it seemed) had stolen a pair of Rock Revival jeans that we sold for $185. I discovered it bc I saw pictures of her wearing the jeans and I didn't remember her ever buying them or wearing them to work. I spoke with the owner of the store, she talked to the employee and she finally confessed that she did steal the jeans. And who knows what other less expensive items she took while she was alone, that no one would notice! Anyway, she was obviously fired that day. Now I have just learned that she got a job working at a gift store in the same shopping mall as our store!! Obviously we were not put down as a reference! I feel like I should tell the manager of that store that she stole from us so she doesn't steal from them, but I don't know, I can't decide. What do you think I should do?