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Hey OP,
Can she tolerate anything natural like wool? You can get her a wool sleeping bag, like pic related. This particular one is from WWII, perhaps you can get one at an army surplus store pretty cheap and with a nice fleece pack liner she'll be cozy and warm. There are also modern day wool sleeping bags that are probably much better.
The only trouble of course is keeping it dry, so make sure she's able to cover it all up with a tarp or something if it starts to rain.
Anyway, hope this helps.
