Update: after watching her all day every day for the past more than a week I realized a few things. 1. Most of the time she actually was hanging out alone and not with the big group of muscovies at that park, the only time she was near them was when they were being fed by people. 2. I did not really see her foraging for food at all, but I did see her getting food from dozens of different people, the thing is literally all of that food was just bread and cereal. So many people literally just dropped entire boxes of cereal and people came in with several entire loaves of bread and just throw them at the ducks. I would say even with the mealworms I was giving her, 70% or more of the food she ate was just bread and cereal. I even tried giving her normal duck feed but she wouldn't even take it cause it wasn't as tasty as the bread. So after seeing A LOT of this I decided to bring her back in last night. So far she seems to be doing at least as good as she was doing there, she gets along very well with both of my other ducks, especially pigeon who just sits next to her preening her and has been following her around everywhere. She is pretty cautious when it comes to me and won't really let me pet her or come eat our of my hand, but I am able to herd her into the coop at night with the others just fine and she is eating well. I hope that soon she will be the best of friends with my other ducks. I did clip her wings and I hope by the time they grow back she is happy enough that she won't want to leave again.