Or offer to get her a new phone and don't spy anymore. Yes, it's a backslide, pursuing type thing, but it also doesn't start a big argument that would be more detrimental in my view.
And I think you know enough to not need to spy anymore anyway.
I think this is the best solution, but I'm not really an expert....
Me-38 W-38; T-15 M-12; S10 and S6 BD - July 2016; EA confirmed; confronted Aug 2015 EA dissolved 12/2016
Never make someone a priority when all you are to them is an option - Maya Angelou