I give my parrot his fruits and veggies in the morning. Each day, he gets a different mix of veggies, though he always gets a few grapes, a few raspberries and some pine nuts in the mix (they are his favorites.)
They are just like us, in that they like variety in their meals. Serve some veggies whole one day, and chopped the next, then maybe lightly steamed (but cooled-don't give your bird hot food) the next. I usually vary between kale, broccoli, squash, carrots, a variety of peppers, cauliflower, brussel sprouts and green beans. He'll get 4-6 of these veggies in some form daily, along with the fruit and nuts mentioned above. In addition, my bird always has pellets available, as well as fresh water.
If your bird is not used to eating veggies/fruits, give her some time to get used to them. Just continue to vary them, and watch to see what your bird likes. You can see best what she likes by seeing what has been chewed then dropped to the bottom of the cage, or by what is just plain "missing" from her bowl.
I also have noticed that by bird's tastes have changed over time. He used to totally ignore squash, and now he loves it. So just because she doesn't eat something at first, maybe she will in a few weeks. Also, one day Morgan loves brussel sprouts, and the next day he doesn't touch them. Again, just like us, they pick and chose.
There are some fruits and vegetables that are toxic to birds, so make sure you read those lists.