Has she ever cheated on you or given you reason to believe that she would?
Where did the two you meet?
Was she going out to bars with her girlfriends before you met?
I'm sure that there are times when your wife goes shopping and does other things, but the way that she relaxes and shares time with her girlfriends is to go out, have a drink and socialize. I'm of the opinion that if a person is a cheater, then they will cheat. If they are not a cheater, then they won't. If she is a cheater, then it won't matter if she's at the supermarket, the library, the children's school, Walmart, she will find someone to cheat with. So it all boils down to trust. With any relationship, we don't automatically trust someone, we make a decision to trust them, many times based on past experiences with them. If she's not going out every night, every weekend, and not taking care of her family responsibilities then you might want to consider that you could be overreacting. On the other hand, if you are noticing a change in behavior and she is not being responsible to her family, then it might be time to sit down and talk about being more responsible, but not to accuse her of cheating right off the bat. The botXXXXX XXXXXne is you have to trust or not, there's not much else we can do.
I welcome your thoughts, let me know if you want to talk more?