K.L.
Hi Lisa - I know how you feel. When our son was colicky and for the first 2 months of his life, he barely took naps or barely sleep much during the night. About one month before I was to return to work, I started to panic. I was terried of what his days would be like at daycare and was afraid for what was to be in store for his providers. We ended up hiring a sleep consultant. Looking back, I don't think it was absolutely necessary for us to hire one. But being first time parents, it was reassuring to have someone close by advising us that we were doing the right thing.
It boils down to giving her tough love - making her sleep in her crib for all her naps and during the night. It will be tough - it's not easy hearing your baby cry hysterically on and off for 2-4 hours. By day 4 - our son started taking 2-3 naps a day and slept 12 hours a night!
Start off by letting her cry for 1/2 hour straight. It must be for the whole 1/2 hour. If she stops a bit, the clock starts over. If she does cry for the whole time, go in her room to see her, lay her back down (don't pick her up) and leave the room. This time, she needs to cry for one hour straight. For every time you have to go in, the next time, the clock is set for a longer time period in which she needs to cry straight through.
I KNOW how hard this is to do . . . while our son cried, I cried right along with him =(. BUT she will stop eventually and will learn to fall asleep on her own.
Hope that helps. Good Luck!