Kicking and biting at her belly are pretty classic colic symptoms. They can continue to eat while colicking, and some rare cases can even pass gas or manure while colicking. Call a vet, and watch her like a hawk. If she isn't rolling or acting really distressed, allow her rest, but if she starts trying to roll, get her walking. She can take some walks even if she's not rolling, the walking action can stimulate "movement."
Good luck, and pet her for me.