hugs... it sounds so tiresome!
What does your dayly routine look like? If you could post it EAS style we can see if she is ready for the 2-1 nap switch. But with the way her sleep is so short both naps and night I would assume she is very OT and you could both do with some rest before dealing with the problem head on. Try anyway you can to get her to sleep. Any AP you can, whatever she needs to let you sleep and get her OT diminished would help the situation greatly.
When did you do cc? Could it be that she has lost trust in you and thus needs constant reassurence that you will be there? Have you ever slept in the same bed with her to see if that helps her get through the night?
Tracy did not advocate these methods because she believed that CIO and CC was something that destroyed the trust a child has with the parent. It takes months to regain that trust and it's hard but fear of a crib is something that comes from cc and cio.... Could this be what is happening? Combine this with SA and that might be what is happening.
Although having her sleep on the ground on the mattress is a good solution for now you might want to think about what will happen when you want to get her to sleep in a bed. Tracy also believed that you should start as you mean to go on and having a child sleep in the safty of a crib is something that will put your mind at ease... If you started co sleeping with her and then moved her to the crib too quickly she may be over anxious about sleeping there.
HUGS hun, It sounds like you have been having a rough time and I think right now is the time to get as much sleep as you can. Do you have family or friends who could take her for a bit while you rest for the day? It seems we can always deal with more when we have had a good rest...