A.C.
Colic doesn't mean anything, actually, as a diagnosis. Colic is the diagnosis that doctors give to healthy babies who cry or seem to be in pain for no apparent reason. No one knows what causes colic (and theories vary from immature tummies to gas to an inability to process serotonin), and so it is kind of the easy way out for doctors who can't find anything wrong with your child and aren't really concerned.
Try noticing and then changing your diet to see if that makes a difference (for example, my baby gets gassy the day after I eat fried foods). Also, you might try some gripe water, which some parents say helps and others say doesn't (it may depend on the baby). You can buy it at the drug store. See if a heating pad or hot waterbottle on her tummy helps. You might check out "The Happiest Baby on the Block," which is a good book that gives advice about colicky babies, as well. Good luck.