Is her breathing normal now?

If her breathing is normal, gums nice and pink (not pale or bluish), she is acting normal, eating, drinking, etc, just watch her tonight and maybe call your vet in the morning and bounce it off them.  It might have been a hairball but if it continues, I'd have it checked out to be sure it's not something else.

If she's still making the noise and/or having a hard time breathing, call the ER now.

I just heard back from her vet. He said to to continue watching her and to take her to our animal hospital if it happens again.  I've printed out directions and have the carrier ready by the door. Thankfully, it has not happened again, she is breathing normally, and her gums are pink. Dianne, I can't think of anything she might have gotten hold of. I vacuumed earlier this evening, so I'm sure there wasn't any small pieces on the floor. :?

I did not think about the stools. That's a good idea. She had a normal bowel movement yesterday and usually stools overnight, so I will monitor the litter box.  I'll be less worried about any kind of small bowel obstruction when I see normal poo.  She's been sipping at the water fountain and ate two pieces of kibble (royal canin 30)...  

She's parked herself in her mouse hunting spot under the kitchen table, and I'm just sitting next to her under the table and rubbing her back.  No purrs yet, but maybe that's cause she's focused on the mouse. Thank you both for the advice and good thoughts. I'll keep you posted.
Ales

oh wow, you're right, she doesn't like me to interfere with her work.  i'll move myself and the laptop over to the far end of the kitchen thank you, susan. i needed the laugh.

That is great to hear Alesandra, glad phoenix is ok!!!

OMG, the subject of your post scared the hell out of me!! :shock:  
I'm so relieved to hear Phoenix is OK!!

I'm sorry to scary you all. I should've made choking past tense  Since I'm a nervous nelly, we swung by our wonderful new vet on Saturday. She thinks Phoenix choked on a hairball and eventually passed it.  I'm supposed to give her a bit of petromalt (available at petco) every other day until she blows her winter coat.  Vaseline will also work. One tip I got to get a kitty to eat petromalt is to put a slightly-larger-than-pea sized ball onto my finger and to quickly dab it onto the side of phoenix's mouth and she'll automatically lick and ingest....  My little girl can now hunt in peace without her mum hounding her  Thanks again for your advice and kind concern! Ales