I'm going to assume you are a bit on the young side. No not really is the answer especially if she has toys. Either way being suspicious and arguing a lot are not a good relationship sign. I gave this advice to my old man once before he went to interrogate my stepmom. If you have already convinced yourself of it then you have two choices. Get over it and fix whatever caused it or kick her to the curb and go grab another. No response she gives you will quell your suspicions so the ball is in your court to decide what you are going to do.