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!