How to get toddler to pull down pants when going potty?

My 2 year old daughter is now able to go to the restroom without me asking if she needs to potty, she will run to the restroom when she needs to go. I am usually able to help her by pulling her pants down for her.. but if I don’t make it in time to help her pull her pants down she will pee on herself. What are some ways I can get her to learn how to pull down her pants when she needs to potty? She knows how to pull them up and down but she seems to want me to do it for it.. which I don’t mind but I would like for her to learn to pull them down herself if I’m not able to make it in time for me to help her.