Good news!! Are you going to consider getting her clipped. I lost a tiel in February several years ago and know he froze to death. I have always clipped my tiels ever since..
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my-africangrey-echo 
Chris
My FIDS
Echo DNA Male TAG DOH 10/20/06
Vern DNA 20yr Hen CAG Rescued 9/20/08
Kodak DNA Male Wt Face Tiel
yet 2 b named Female Quaker DOH 10/13/08
I am not a vet, no member of a message board can substitute for a visit to a good avian vet in the case of potential health problems