The above is all excellent advice!
At first she isn't going to recognize veggies and stuff as food. But she will! And she will love it! I've taken two budgies that never had veggies and now love all kinds. And two Quakers who never had veggies before either and now pig out on thrm.!
Hera are tips that worked for me. Offer veggies and all lettace and stuff in a sturdy shallow casserole, or serving dish. This makes it easy for them to see them, walk around in them, and just touch or pick up one at time. I have mine placed in too of my flat cages.
Second I offer tastes by hand. Everything I'm am cooking, eating that is safe I offer them a taste. Feeding them things by hand helps them recognize it as food. And the more things she trys the beterr and braver she will get at trying more things! I will even give a bite or two of cooked pasta, toast, scrambled eggs, boiled eggs, cooked chicken, oatmeal , plain popped popcorn., Cooked lentils, cooked beans ect.
And like above I make a big deal about eating some in front of them first. Really smacking my lips and saying yummy.
Some foods she might be quicker to try are fresh peas, or frozen peas that you thaw. Never used canned anything for parrots. Some fresh corn in the cob, cut some off and offer a chunck if corn still on the cob. Cut up apple, a piece if broccoli, shredded carrots. Hot red chilli peppers, seeds and all, or bell pepper. Cooked butternut squash, cooked and mashed sweet potato. Summer squash, like yellow squash and zucchini. These also have soft seeds in the center and you can scoop them out and offer by hand, she might recognize the seeds and taste quickly. Green beans, Cucumbers. On the leafy greens mine like Romain, and spinach, Swiss shard, watercress.. any leafy green you can eat they can eat too.
O had all mine eating veggies within weeks. And I think offering things by hand , tons and tons of stuff by hand, and eat it with them and infront of them was the key!
Also you can make many toys your self! Cut up plain cardboard into different shapes and punch a hole in them and thread a zip tie through them and attach to the cage! Offer part of a paper back book pages threaded thought the bars for them to shred and destroy. Plastic bottle caps in a cup, so much fun for them to take out and toss around. A box of Kleenex that can pull all the Kleenex out oh the joy lol. We have threads on do it yourself toys here.