Pediatricians tell you it's colic because they don't know and they can't stand anxious upset mothers. Seriously. They can't even define "colic," except to call it "crying for no reason." There is a reason, we just don't know what it is. So in your baby's case, you have to play detective. Write down what time she started crying, what happened beforehand (if you can make a connection, maybe it's just a coincidence), what made it stop, and what time. Every single time. For a twenty four hour period, or until you have enough information to show a pattern.
It may be reflux, for example, or it may be constipation. If she's eating like that all day, it could be reflux (because the stomach acid comes back up and it hurts, and sometimes eating makes it better). If it is, it might also help to hold her upright.
My firstborn used to scream like he was being tortured. Everyone shrugged it off as "colic." He had severe reflux, and he also had constipation. We took him (over our pediatrician's objection) to a pediatric gastroenterologist. She prescribed two medications, and putting oat cereal into his formula, and BabyLax (which we hated, but if your baby is screaming and won't poop)...by the time our firstborn was four months old, we gave him baby food pears instead of the BabyLax and it helped just as well. We did all this after he was seen by a gastroenterologist. We didn't just set up a whole bunch of home remedies. But her treatments stopped the crying on a dime.
And in your baby's case it could be something else.
Also, some children are extremely sensitive to sound. Try turning the TV or stereo off. They can't ask you to turn the TV down. If there's loud talking, speak more softly. A lot of little babies don't like a lot of noise. Or extreme temperatures. She may be too hot. Make sure she's not overdressed. She may hate the labels in her clothes. Try cutting the labels out of her clothes and see if it helps. If she cries for "no reason," make sure that there isn't one kid of outfit she prefers over another. A lot of baby clothes are soft on the outside and very rough, even with a stiff scratchy seam, on the inside. You might try dressing her in baby sweat pants and a t-shirt with the label off as an experiment to see if it isn't just that she can't stand the feel of those clothes on her skin.
My personal feeling is that "colic" is pediatrician-ese for "I don't know what it is, so I'll call it 'colic' because if I can't solve your problem in a fifteen-minute visit, you're an annoyance."
If the crying starts to drive you crazy, put baby in her crib where she'll be safe and go out to the next room and read a magazine or take a five-minute shower. Or call someone.
Hang in there!