Friends wants me to wait...🙄

She is 20 years old and is about to be 21. I drive and she can’t because she can’t pass the driving test. So whenever we hang out her parents drop her off and pick her up. And she wants me to wait for her parents to pick her up after we go to the beach.... um I don’t want to. My car is across the street, I am going to walk to my car and leave. She can stay on the beach and wait for her parents to pick her up... she’s an adult, she will be fine. She upset at me for not waiting. I tell her to just study and then maybe she will pass the test and then we can park next to each other

Update since y’all think I’m a bad friend. I’m her only friend. And my car is about a half mile walk from the beach. I’m not going to waste my time standing on the beach waiting for her mom to pick her up when I could just walk to my car. And FYI I am an amazing friend. She failed the test 2 times already so I am helping her. I am teaching her what to do at a stop sign and things like that