CorvusCorax
Deary me...
She's still very young.
I'd also rule out an injury/discomfort or some form of stress she's experienced when out and about, she may have linked the cue of getting ready for her walk to a negative experience.
I've played around with my dogs' exercise and training/fitness a lot over the years, to be honest I have probably overdone it in the past and at the moment they are doing very little in comparison, they have adapted just fine.
I'd also rule out an injury/discomfort or some form of stress she's experienced when out and about, she may have linked the cue of getting ready for her walk to a negative experience.
I've played around with my dogs' exercise and training/fitness a lot over the years, to be honest I have probably overdone it in the past and at the moment they are doing very little in comparison, they have adapted just fine.