Youve posted while i was typing but ill post anyway -
Is there any way you could bring her inside, she has a fair time to go and she can't carry on if she's not well, if she is having to haul herself through mud it won't be helping. Maybe a closed area, still with fresh air of course.
I feed Caprivite, esp during winter.
How much concentrate are you feeding? She shouldn't be that big yet, you shouldn't be feeding much until about 6 or 8 weeks before kidding.
Are you feeding haylage? I've noticed mine look more pot bellied since we've gone onto haylage. Reading on a website there is more feed value in haylage so mine are getting very little concentrate, when its cold they get warm soaked sugar beet, but get chopped carrots, Brussels and cabbage.
You say wet nose, do you mean 'runny' nose?