She is going to need reminders for a long time to come, so please try not to let this get to you. It is ok to be broken record sometimes. This is how it goes in my house every morning, and my kids have totally normal attention spans, they are just kids: "It's time to brush teeth." child walks towards steps, then sees cat and stops to pet him "Jane, it's teeth time." child goes up the steps and sees her sibling and starts to talk to her. "Jane, teeth please." child finally brushes teeth. "Your teeth are nice and clean, good job Jane." (A hug with some praise at the end is really important).
In the bathroom above the sink, I do have a printout posted that has this list on it (plus some funny cartoons):
Brush Teeth
Floss
Rinse sink
So at least once they are in there, they have a visual reminder of what they need to do.