Budgie vomited

I took my budgie outside with her cage and removed the bottom of the cage so she could nibble on grass in the back yard. I have done this many times before and she was fine afterwards. But today after eating grass, she started vomiting up whole seeds with this yellow-ish sticky stuff.

I've researched the difference between regurgitating and vomiting and this was definitely vomiting. I don't know what happened! She has never done this before and she was shaking her head while vomiting.
Right now she seems ok. She isn't fluffed up and she's active. But what could have caused her vomiting?

Thank you

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Dec 28, 2011
Budgie vomiting
by: Author of question

The grass had not been treated with anything, so she might've had partial blockage. Luckily she has not vomited since and has been eating and drinking.
Thanks so much for your help.
I really appreciate it.

Dec 28, 2011
Budgie vomited after eating grass
by: The Avian Vet

Is it possible the grass was treated with a fertilizer or sprayed for buds and weeds? He may have ingested something else or the grass may have caused a partial blockage. If the symptoms persist, then take him in to see an avian specialist.

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Dr B

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