Dr Harvey Karp (Happiest baby on the Block) would say it's just fine to let your baby sleep in the swing. he advocates the 5 S's: Swing/jiggle, Shush/white noise, Suck (paci or thumb), Swaddle... sheesh I can't think of the 5th one, sorry.
My son slept in his swing or vibrating bouncy seat (or on one of us) until he literally outgrew them. He's 2 now and just learning to sleep w/o motion.
I'm not saying we did the "right" thing by doing the motion thing constantly, but it's what we HAD to do. He would NOT sleep alone unless he had the motion.
You do what you have to do to keep yourself sane and your baby safe.
If she sleeps better in an upright position than laying down, she might be having a little trouble with reflux. In that case, a bouncy seat might help, even if you don't use the vibration setting. That did help w our son sometimes.
oohhhh do I feel for you- I didn't sleep for over a year. Turned out ours was having problems related to milk/dairy. If your baby is excessively gassy and having trouble sleeping because of THAT, try eliminating dairy for three weeks and see if it helps. (From your diet if you're breastfeeding, and from her formula if you're not or if you're supplementing. Try a soy formula - w a doctor's ok, of course). This solved a huge portion of our night wakings w/in a month.
Another thing you can try is to wear your baby in a sling during the day and/or before bedtime.
Get Harvey Karp's book or DVD it is worth it!