Parents tend to want to know what is going on because they sense things aren't right and want to try to fix the problem or understand what is going on. They mean well, but they need to allow the couple to work things out on their own. Your wife's response was more than adequate. If and when she is ready to tell them anything, she will.
You've been doing well in giving her some space and not pressuring her. Hopefully in MC one of you can mention "boundaries and how to set them". Her parents are going to push her for answers and she's no where ready to open up.
Yes, it was funny that her father called her to ask about hunting with you. She's not your mother! LOL! Any way, don't be surprised if he raises the issue of what is going on w/you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.