I’m new to this series of threads and coming in a bit late. I did want to chime in with one thing.
For those who have suggested she was dropped off at the park to buy drugs... I know people who take Ubers to buy drugs because they don’t have a car. You don’t just have them dump you in a park and wait with drugs for however long until you may or may not be able to summon a ride late at night. You tell the Uber you’re dropping something important off for a friend, add another stop heading back home, and go back on your merry way moments later. The fact she got out and was left in that park makes me think she intended to meet someone and stay.