Agreed, look at your local Craigslist in the for sale section for muscovy ducks. There are always some available near me. Best bet would be either a single hen or a pair of hens to be friends with her. You can get young ones, but they should be a similar size to her so you can put her with them.
They absolutely love flying and exploring. I've had to go to my local park to get mine a couple times after they molted and their wings grow back. I think if you don't have like a big pond and only have a kiddie pool, and want to play it safe, it would be a good idea to clip. Especially once you...
Oh also since she is a Muscovy hen, you will probably want to clip her wings unless you have her in an enclosed run. Muscovy females have a tendency to fly away to the nearest lake or pond.
Just in case you can't find a good duck feed near you, here is a link to a very high quality waterfowl feed that you can order online
https://www.chewy.com/mazuri-waterfowl-maintenance-duck/dp/248786
Also your new girl is adorable! Think of a name for her yet?
I would say just go to a local feed store and buy any feed that is duck specific or all flock, and it would be a great idea to try and find another female Muscovy duck to be her friend. She will do much better if she has a friend. Its awesome that you took her in!!!