Chick cried randomly and seems sick with spittle?!?

My 5 week old Americauna was outside and she suddenly cried out and shook her head. She shook it once more and now I took her inside and she seems to be really spitty in her mouth. She seemed to trip a little, but her walking is fine. I see a piece of grass in her mouth, but she doesn't seem to be choking because she's not holding up her head and trying to swallow. She occasionally opens her mouth and her mouth is really spitty. What is wrong? Is she choking??

I googled, do chickens choke and found some information there that sounded like your situation. Read through the comments. https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.backyardchickens.com/t/679037/no-emergency-chicken-choked-to-death-just-wanted-some-info-what-to-do-if-it-happened-again&ved=0CCAQFjABahUKEwi14MPfsYzJAhVDND4KHeSTCh8&usg=AFQjCNEOS6GYS2cv1z8h_bJn_Fg29gNRng&sig2=blO7YWKlO_UUpSlkjS4cFg

Sounds like she may be crop bound, Do not feed her until the crop is emptied, usually just use a couple of cc's of mineral oil down the throat clears them up, or about a teaspoon of Apple cider vinegar about 6-8 hrs before the mineral oil usually clears them up. For severe cases there is a medication that can be given.
Whole dry oats are the worst about getting hung up and causing the problem, I'm sure there are any number of grass seeds that could cause the problem in free range chickens.

I try to put a couple table spoons of apple cider vinegar in my chickens water on a regular basis. Sometimes it doesn't happen but when I have young chicks I put a bottle of the stuff in the coup so that every fresh fill of water gets a dose. It seems to help keep the chicks healthy and strong. They are so much fun to watch be bop around when they are little but it can certainly be taxing on the nerves when you run into something like what your dealing with. I like the comment to let the crop empty before feeding again. I hope your chicky is feeling better soon. Keep us posted.

Well, the good news is that after an evening of passivity, she is doing ok today. Since when we looked in her mouth the only thing we could see was a tail end of grass, could it be that she plucked a piece that was too long and so it didn't go down all the way at once? And kept tickling her throat? It seemed like it was related to something she had eaten, since she kept opening and closing her mouth. I worried that she might have eaten something sharp but she seems to be ok today. She was very passive that whole evening, not eating, just sitting on my lap dozing, but now she is back to running around and competing for tasty morsels, so it seems that whatever it was has passed. Thank goodness! Thanks for your tips and suggestions!