Girlfriend has nude photos on snapchat

So me and my girlfriend have been dating for almost a year now. Everything's been fairly OK up until about a month ago. She was showing me different pictures she had on snap chat swiping through many of them when all of a sudden she swipes to a naked picture of her in a dressing room. She quickly turned her phone away and tried to play it off. She said she took it for me but didn't want to send it because she didn't really like it. I don't even have a snap chat to begin with. I got really upset but decided to give her the benifit of the doubt. It's been a while but this still eats at me. So I guess my question would be, what do I do? Do I confront her about this again and risk the relationship or try to get over it?

Lets state facts: 1. You have no snapchat account. 2. You saw a photo from the phone of a naked girlfriend. Judge for yourself.

Hi, I can understand you being suspicious since you don't have a snapchat account. However, it really could have been her intention to send it to you after probing you to open an account but changed her mind. I suggest to not mention it again as it could have genuinely been for you and no one else and instead reflect and discuss with your girlfriend things you like about your relationship and what you both would like to improve on e.g.have goals (what do not like about your relationship? why do you not like those things? How could you improve that area of your relationship?). Reflection is usually an effective way of improving our perception about ourselves and awareness of others actions, feelings, etc. and therefore improve our relationships.