What would be best is to forget the translation stuff, and address what speaking in code represents. There's a fundamental lack of trust happening. She doesn't trust you to understand whatever she is speaking to him about, and you don't trust her for her cautious behavior and lack of openness. Explain it in those terms, and ask if she's willing to explain what happened or why she doesn't trust you to know what was said, and that you'll do your best to be understanding. Trust and openness is hard, but it really is the key to a healthy relationship.
Here's my cold-read on the situation, for what it's worth: He's not entirely over her, and she's not entirely over him. He's pushing to get back with her, and she's trying to find a way to distance herself from him without hurting anyone, but is having a hard time doing so. She is afraid you'll be upset or will have a hard time understanding and is not explaining things, which makes you upset anyway.
Also, about that "very sweet comment"... maybe I'm misunderstanding what was posted where, but I'm detecting a hint of possessiveness and passive aggression:
She had had a status update, and I had left a very sweet comment onto it explaining how we're more then just together, we are friends and partners. She deleted it shortly after due to his dissapproval
That's a road you don't want to go down... and snooping around for information, even if found "just in passing", does not help you change course. Be open and honest about your concerns, extend her an olive branch, and let her explain why she feels a need to keep her messages private. Then, if she doesn't want to tell you, you'll just have to respect her wish for privacy, and let her know that you're open to talking when she's ready to. It can be really hard, but give her the time she needs, and make sure she knows you'll do your best to understand.