Ok I'm far from an expert, and mostly I'll be rehashing what other folks have said here. And full disclosure: Bumble's breeder weaned her on to fresh food and she eats everything I put in front of her, so I'm lucky and haven't had to do any of this stuff I'll mention below.
First and foremost, an all seed diet is not good for her. Too much fat. An ideal diet would be (in this order) fresh veggies, fresh fruit, pellets, seeds. Oh and I'm the fresh category they can also have pasta and grains and potatoes and sprouts (sprout your own. Super easy and birds LOVE them).
As for what she likes-experiment. Just give her everything and see if she'll eat it. If she doesn't like it, prepare it differently (cooked instead of raw, cut into bigger/smaller shapes, etc.). Eat with her (use your own plate - our saliva is toxic to them). If she sees you enjoying something she might decide to try it. Wait a week and give her whatever she didn't like last week. Rotate it so it stays interesting. Have fun exploring options with her. I've tried several new things since Bumble came home.
Pellets: there are a million brands. I picked Harrison's because it seems to be high quality and I'm able to get it locally. Regardless of what you choose, the Harrison's website has information on how to do a drastic diet change that may be helpful.
Oh and make sure you get that little sweetheart into a certified avian vet for a new bird well-check. They will also be able to help you with diet and it's a good idea to establish a relationship before you need one.
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Marcy is gorgeous and lucky she found you. Sounds like you are on the right path in helping in getting her as healthy as can be. Thanks for taking her in and a big WELCOME to this awesome forum.
