As other posters have said. She should be just fine outside if given adequate access to shelter, fresh water at all times and good hay.
The last point (good hay) is key here.
Having a horse outside 24/7 is usually healthier, BUT check out the stables feeding regime....if they just slap a round bale out in winter and don't ensure the hay is still in good condition (round bales can and do get dusty if rained /snowed on and left to sit too long)...even w horses eating at them.
Some pple see hay and figure that's good enough, when was the last time the hay was checked for moldy parts, or dust etc
Proper management is key.
A horse outside 24/7 on crappy hay is going to be worse off then a horse on good quality feed who is stalled for 12hrs out of the day.....just food for thought
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Last edited by Maverick101; 08-29-2012 at 05:23 PM.