I know there's a huge difference between Budgies & a larger bird 
- but the only way i could get Laker interested in fresh greens was to offer a bowl of sprouted seeds that i found at the health store.
They were in a large plastic container - the sprouts were packed in with potting medium [not soil] & the sprouts were about 2" tall. They offer Sunflower/Beet/Peas in these containers. We humans would use them clipped off, in salads or a garnish. Laker likes to munch on them - they're very sweet. I had tried clipping the trimmed sprouts to the cage or hanging them like a toy but they got ignored that way. I also dug out a bunch & put them in a bird bowl - had to water more often tho & mist. The nice thing is you can 'forage' along-side your fid - birds like to do what their flock is doing.
Others have helped me figure out what my fid would like - by trial & error - & they didn't have a Budgie. When i started recall training i also reduced the availability of his favourite foods first thing in the morning when he's his hungriest. You might try pulling his favourite food & offering them as a treat or reward. I think the confusion & hunger together made him more receptive towards the new foods. I am not saying starve her or deny her favourite foods - just mess with her mind a little

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The sprouts were beside his cage where he hangs out most of the time - i was over there misting & playing with them a lot. He became curious.
If you really want this for her she'll figure it out eventually - how are you with snacking on raw carrot or celery?