What did she eat last? - just before she threw up.
Did she eat since she threw up?Does she go outdoors?
Please stand by for a few minutes while I type detailed answer.
Your cats actions indicate that she has somethingh stuck in her stomach that she is trying to move. It can be a hairball thread, string, a twist tie, piece of toy or plant, etc.
If you have hairball remedy like laxatone, petromalt, or even plain vaseline put a one inch strip on her paw so she will lick it off. Give her either canned cat food, cottage cheese, tuna or milk - something squishy to try to push it through.
If she cannot pass it and this continues you will have to see a vet with her and get an xray so you can see what is going on with her.
Please get back to me and tell me if you are having any success with the above foods. I wil stand by to hear from you.