Trying to get wife back into it.

I brought the idea up to wife about 5 years ago. She is very reserve but enjoyed talking about it during sex. After about 3 years into it she said she would. She had everything set up. Met up and came back home and she said she let him cum inside her. I was turned on and got between her legs and licked her. I couldn’t tell if she had or not. After I got off I was upset and said I couldn’t believe she did. Of course it was pnc. So she said she didn’t do anything. She stillsays she didn’t. I want her to try again but I feel like I’m probably pushing her too hard. What can I do.