Are allergies to rabbits not as bad when they are indoors?

i really want to brng my rabbit in to live inside but my mums a bit allergic to him, when hes outside she keeps well away from him and she is fine, but if he was to live in my room and if i keep him clean as much as i can (and the cage), and i keep my room clean will the allergics be as bad or will they be more mild? hes a french lop.