Okay, I'm confused. Let me try to assess a few things for clarity sake.
1. she had a secret email account with contained emails, pics. 2. she also had regular pics on the family computer. 3. You are piecing, but don't talk about the R or the OM. 4. You are in MC or are you starting MC next month.
If you just have monthly sessions that doesn't seem really effective.
My IC recommend the following approach when bringing up something. He likes the phrase 'I'm upset that (for some that might be too strong)"he also says that you need to reassure, as Sandi and Jack say. I would suggest that you acknowledge that you know how hard she's working on things.
It is a tricky situation for sure. I'd tread very carefully. Some people find the safety of the MC session a good time to bring up things. I know for us, my W and I brought up things in the MC that we never told eachother. They weren't bad just some thoughts we each had. Of course this depends on the counselor.
But since it is a long way off, you might no be able to wait.
Patience is bitter, but its fruit is sweet. --Jean Jacques Rousseau.