Is she spayed? Was she a rescue from outdoors? Cats (this is the reality) belong outdoors. Every cat whether breed specific or stray has roots to their wild ancestors and in some of them, the pull is strong to get out in the world and feel free.
Sadly, the world is no longer a safe place for kitties. They are abused, tortured, run over by cars, terrorized, exposed to dangers, diseases and they roam.
So the best thing is to keep her inside. Make the doorway a place she doesn't want to get near. Take your vaccum and plug it in, when she runs to the door, switch it on. She will scatter. It will scare her, yes, but it will also keep her safe, so is the trade-off worth it?
Use lemon scent to keep her away. Clean the door daily with lemon oil and then spray lemon scented disinfectant around the doorway. Hang those powerful auto air fresheners lemon scented on the doorknob, low enough to get in her scent path.
Provide her with a safe place she can be outside- meowhoo
has listings for merchants that offer this type of protection for your cat.