Something to be concerned about? Snapchat

Two years past wife's EA. She has shown remorse and our relationship has improved(although it will never be at 100% again). She communicates all the time with her girl cousins and aunts on her iphone via an app called GroupMe. On a recent trip, she told me she was downloading an app called Snapchat because all her family had it. I didn't think much of it til I saw somewhere that it could be used for a sexting app. Of course my mind starts to race. I went on a trip this weekend with my son while my daughter was staying behind with my wife. I then learned my mother-in-law came and got my daughter for the weekend giving my wife a weekend by herself. Mind racing again. This morning, my wife hops in the shower and I look at her phone. I check the recently used apps and it looks like Snapchat was used recently(or at least opened) but it doesn't look like any messages sent or received since July 28th. I know messages can be deleted though. This is what cheating does. Leaves you paranoid and you don't know if this is nothing or if this is something. Does anyone know anything about this app? Can it be monitored somehow? I'm being patient and calm this time. I could make a huge list of the things I did wrong when I stumbled upon the EA two years ago and I won't make those mistakes again. I also don't want to get myself worked up and triggering all over if this is nothing. Advice?

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