1) She could have pancreatitis, in which case she would need bloodwork from your vet to confirm it, and would likely need hospitalization. Fatty table scraps can cause this, but it can be caused by other things, too.
2) She could have a foreign body obstructing her intestines or stomach, and would need xrays from your vet to diagnose this, and then possible surgery.
3) She could have gastroenteritis, which is inflammation of the gastrointestinal tract from an unknown cause.
4) She could have organ dysfunction, which would require bloodwork to diagnose and then potential hospitalization.
5) She could have intestinal parasites, which would need to be diagnosed by a fecal sample.
She is most likely uncomfortable right now. The best thing for her would be to see your veterinarian to find out what is wrong with her. In the meantime, however, you can try this. Do not give her ANY food or water until late tonight. At that time, if she has not vomited, you may offer her a small amount of water. If she holds that down, you may offer a small amount of a bland diet of boiled chick breast and white rice in a 50/50 mixture. If she holds that down, you may feed this diet in 4-5 small meals throughout the day tomorrow and the following day, and then if all goes well, you may switch back to her regular diet on the 3rd day. If she continues to vomit, however, you should take her to see your vet.
Hope this helps! Best of luck.
She is not retching or dry-heaving. Everything has been productive. She is now throwing up the water and foam. Her belly is not distended and hard.
I don't think she has a foreign body obstruction as the vomiting only started within the last 3 hours. I will try what you have suggested first (I am a single mom who is currently unemployed at the moment and don't have the funds necessary to take her to the vet at the moment, but I don't want her to suffer either). If she is still in this state tomorrow I will call her vet and take her in.
Do you have any suggestions as to why this might have come on so quickly? She seemed fine last night and earlier this morning. The symptoms didn't appear until a little before lunch time.
Any additional help would be appreciated.