Carol,
This is a tough situation! Where do you draw the line between help/support and enbling? It is so hard to know.
She does not want to be treated like a child, yet is doing nothing to prove her maturity or autonomy...thus forcing you to do the mothering...to a 34 yr old! She can't have it both ways.
Do you have a written contract with your daughter? We have one with our adult kid living at home. She must comply with the agreement as a contingency for living here.
In this way, even if she blows it, we don't need to have an emotional response, we simply remind her that she is in violation of her contract...and will lose the priveldge of living here if she doesn't redirect her behavior. It works pretty well.
As far as resources, here is the link for NAMI. I believe that they can help you in some way as far as getting her motivated...or at least to place the accountablility somewhere else besides you!
http://www.nami.org/Template.cfm?section=Find_Support
I feel for you. It is really hard when your heart and mind are in a war as far as what to do.
However, lovingly helping your daughter to find her own strength, though it might cause problems initally with her moods, may be the greatest gift that you can give her.
Best wishes with this.
S.C.