Get her some REALLY warm boots!
That is the part of me that used to get cold and drive me out of my stand.
I bought some boots from Cabela's a couple years ago after freezing my feetin -4 temps.
They were the best 200.00 I have ever spent on hunting clothes.
I don't remember the brand or model but they have like 3" of insulation under your feet.
It really stops the cold from coming up from the stand platform.
They are big and bulky but worth it if you are stand hunting.
They suck for stalking

Warm feet= Happy hunter