Well the first step would be to stop trying to feed her. Regurgitation really tears up the upper digestive tract and, until it heals, any food offered will probably be gurged also. I'd wait two or three weeks and try feeding her something very small. Make sure the temps stay warm. If she regurgitates again, I'd take her to the vet. If this is a very young snake you might just want to go ahead and go to the vet.
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Martin Whalin
My Email
Quotes from guys named Carl:
"Science stops at the frontier of logic. Nature does not, she thrives on ground as yet untrodden by theory."
-Carl Jung
"It is foolish to let singleness of purpose deprive one of the joy and delectation of the many wonderful sights and sounds incidental to the quest."
-Carl Kauffeld