Is my wife a thief?

My wife and I have been married for four months. We have a wonderful relationship and get along very well; however, she has one major problem. She steals money. The first time I noticed money was missing from my wallet, I didn’t dwell too much on it, thinking that maybe I’d spent it. I then noticed money missing from my bedside drawer, and that’s when I started suspecting her. But I ignored it, being my wife. Now recently, my brother and his wife came to visit and they lost money yet we were the only ones in the house. We do not have a maid, and we do the chores ourselves. We only have a guy who comes around to wash clothes once a week and we are always around, I can’t imagine he’s the one as he never enters the house. This confirmed my fears, and I am confused about how to handle this situation. How can I find out for sure if it is her? And if it is, is there any way she can be helped?
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Times Reporter