This might sound weird. I raised and potty-trained 9 kids. Growing up comes in stages and at each stage some of their special babyness leaves and they're expected to do things on their own which means less you time. So, when she learned to walk you stopped carrying her. When she started taking a sippy cup you stopped holding her. If she goes to the bathroom by herself all the time, she'll loose you for that too. Find a substitute for her changing time and explain it can only happen when she goes to the bathroom by herself.