She probably checked that message as it was to her best friend, a nightmare among females I think is having their boyfriend sleep with one of their friends?
Give her the benefit of the doubt that it was a one time thing based on these circumstances and move forward OR call her on it and ask for an explanation. Those are really the only two options. You can't bring this up later on in a fight as it will make it a lot worse.
Just be damn sure it wasn't you that left that particular message open as this is a big accusation to make.
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"In brightest day, in blackest night / No evil shall escape my sight / Let those who worship evil's might / Beware my power, Green Lantern's light!"
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