Hi C.,
It is tough when you are not getting enough sleep! You are doing a great job just coming to others for support during this difficult transition. Two things that come to mind:
1. Have you tried sleeping with your daughter? Does she do any better - meaning does she sleep longer when with you? If so, she may just feel the need to be with people right now. Sleeping with mom provides protection from SIDS, as baby regulates breathing to mom's breathing. It may be your daughter's way of protecting herself right now.
2. If she doesn't sleep more than 10 minutes even with you lying down, then I'd talk with your doctor about the possibility of reflux. A baby not being able to lay flat, and in this case, being okay in the swing which has her slightly upright, can be a signal of reflux. Kiddos don't always have excessive spit ups - there is also silent reflux, which means that the stomach acid rises out of the stomach into the esophogus, but then goes back down. There are a variety of things to do if that is the case: breastmilk, probiotics, putting a 4x4 under the head end of the cosleeper, babywearing (I, too, LOVE my Ergo carrier), continued swing sleeping, and last resort is the prescription meds.
For the time being, could you move the swing into your room so that you and your husband can start to catch up a little on missed sleep? We bought the Amby baby hammock for our son's reflux/sleep issues.
Good luck!
H.