Good job on Ellie but if you REALLY wanted to be an angel go seek out the fellow and ask for his HELP. Explain to him that you have a pup that is scared and could use his aid to get better. Then add in the tall part. Then add in that his limp makes his walk less predictable and confuses her. But stress that he is helping not scaring. You might find she improves and you bring some joy into his life (and hers as she would have a new buddy)
Just a thought and maybe to much.