Hi Rebecca,
Welcome to the Disney Parks Moms Panel! What a fantastic way to close out your day after a visit to Magic Kingdom Park!
'Ohana is a beautiful restaurant and the food is delicious!
I can understand your dilemma. First, I suggest checking the closing time for Epcot. Epcot typically closes at 9 p.m. but does sometimes have Extra Magic Hours that would keep it open until 11 p.m. The monorail will run at least an hour after Epcot closes.
If you are still concerned about your car in the Magic Kingdom Park parking lot, I believe you have two options. First, you could leave your car where you park it in the morning and if the monorail has stopped running you could use a car service like Uber or Lyft to return you to your car. The second choice is to move your car before your dining reservation. If everyone doesn't want to return to the car you could designate one person to take care of this chore. The rest of your party could take the Monorail, Ferry, or boat over to
Disney's Polynesian Village Resort.
Rebecca, thank you for stopping by with your question. I hope you'll let us know if we can help you with any other questions!
Wishing you a magical vacation,
Amy H.