Did you expect anything different
But seriously....does she have enough hay and does she eat it? If she doesn't like it she might not eat enough to keep her heater going. What also helps a bit is warm water to drink. I used to pour hot water in their troughs evening and again morning when it got below freezing.
Same with the evening meal, soaked alfalfa with their usual ration, warm.
Blanketing her might also be counterproductive, since she can't use her own thermoregulation when blanketed.