Yup traction is key for a tripawd.  I wonder if her owner has non slip rugs or yoga mats at home so she doesn't slip.  Tripawds need a pathway of sorts to help with their stability.  I'd be afraid to walk too if I knew I was going to fall.  Again bless you for trying to help this sweet girl and hoping her owner will consider letting you continue or picking up on what you can teach her.  I totally agree with the others that rehab would be amazing for this girl to get quality back into her life.