Hi Mike,
I would think not directly; she has no awareness of her weight as such, and 3 days won't make any any appreciable changes in it.
Was the lake trip a big change in her routine? There may have been something at 'squirrel haven', or with her car rides, that was unappealing. Rolling over and acting coy is not a strong resistance action. Think like her about those experiences.
Or, did your vet say if he was wondering anything about her heart? Have heartworms been absolutely ruled out? Tests and meds are not infallable. Some other cardiac problems also take a moderate amount of exercise to present any symptoms, and she would be the first to recognize something like a 'funny' feeling. How does she react after play exercise at home with you?
This problem does seem more medical than it originally did. Would you consider trying the easier approach of slower starts working back to the timber area? Maybe a truck ride there to see what her reaction is, to test the psychological aspect a bit more before starting on the medical side.
If these approaches bomb, then try her vet again.
If you think I can be of any further help, (providing, of course...) let me know. Or if you have other thoughts, let's hear them.
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