How do you deal with setting boundaries with your mom and we are really close and now it's just like nothing happened?

I told her I wouldn't watch her dog anymore/ she asked me to watch her dog about five or six times. She finally accepted my no. Then we took some space from each other for about a week or so. Now I'm just trying to let it go and remember to stand my ground if she asks me again for another time to watch her dog. But I just feel on edge. Like just waiting for her to say something now or now we aren't as close as we were...thoughts?