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Hi, I can help you with your question today. How long has she been like this? Does this also happen after she is active indoors (rapid fatigue)?
I would not expect the cold alone to cause these signs.
The GI upset could play a factor (most likely due to one of the medications) if she is having significant abdominal pain. I am also suspicious of a condition that causes severe muscle weakness called myasthenia gravis. Could you try walking her around the house (inside) on a leash for about 5 minutes now and see what happens?
OK. Perhaps it has something to do with the timing of her meal rather than walking. I recommend that you try walking her tomorrow prior to her meal. If she is ok after her walk, feed her, then monitor her after the meal. I think this will help us narrow down the cause of her problem.