> "Maybe your brother can gently enter her 'domain' bearing a gift of her favorite treat, just sitting down and letting her approach him. Once she is sure that there is no threat, and don't make direct eye contact until she asks for it. That sort of approach should work, she is just a bit nervous.
Good advice and thanks.
On similar lines, one of my sisters suggested that my brother might remove his Cap (which he even wears indoors), perhaps that might help.
Maybe the Cap itself is viewed as a "threat."