Great suggestions on going to Schneiders Tack and looking at the Weatherbeetas; you might just as well Bite the Bullet and buy a new one
Big ditto on buying a blanket with gussets so your horse has more room for movement.
I am in southern Middle Tennessee and also feeling some of that ugly cold,
For the record, after the record high temps of this week, we might plummet to single digits by next week sometime -- depending how far the Polar Jet stream decides to dip south
Meaning - order the blanket - lol lol
Be sure to buy a waterproof blanket. Medium weight should be sufficient, unless she's a really hot horse, then buy a light weight.
One of my four wears a light weight and doesn't even need that on the raw/blustery days but Mr. WTW put me on such a guilt trip about "everyone else having a coat", that I broke down and bought the light weight.
The lightweight has come in very handy for another horse that doesn't grow any sort of winter coat and has had some digestive issues lately. The vet told me to keep him blanketed on bad days, so the lightweight turnout has paid for itself for him on the days it's been too warm for his medium weight.
Hope this helps and I hope you've got pipes wrapped at the barn and under the house. Burst pipes are not fun to deal with in the winter
Being from the north originally, I learned water lines don't get dug near as deep south of the Mason-Dixon as they do north of it