[Shore momma]

Where to start :-/ bought a 2003 Mercury Mountaineer for my mother. Had only one key and no door code. She went to put the groceries in the house, left the driver door open, came back out and now it locked on her and she cannot close the door. She has been using zip ties to close it. Living in the mountains is not the best for this option! She has had repeated locking problems. After looking online I called and walked her through how to get the door code and she says there isn't any sticker on the box where it is said to be. Please help!!!!!!!!
I apologize for any typos, I'm doing the research from my phone tonight.
I hope the picture comes up correctly. It's of the front driver door open and locked.