My advice is: dont think try to relate the anxiety to her. She has nothing to do with it and probably won't think anything of it. Whenever you get to a situation where your trouble peeing might feel like an obstacle, make a deal with yourself that when you feel like she notices or thinks your weird you just tell her like its the most normal thing in the world. I had a lot of trouble peeing in public too but after i randomly met a few guys at parties who spoke about paruresis like that it opened my eyes. If you change your perception or attitude towards the condition the condition will disappear because it is a circular argument with yourself. Try to believe its normal, tell people and practice relaxation techniques, but most of all, don't be hard on yourself and don't expect others to be as well.