Wow, That is a tough one, especially if she is there in the Dojo with you. I have an extremely jealous wife who would totally flip is she saw how much close contact we have with our training partners. Fortunately she is not interested in watching me train.
My wife doesn't train. She is at the dojo once or twice per month to collect dues & take care of other dojo business. I think it would be easier if she did, or was at the dojo a couple times a week to keep an eye on me. Then she would see that I am not up to anything.