Hi Don, welcome back!
Dusty is beautiful! How long has your aunt had her? I'm asking because sometimes it takes a while for a cat to adjust to being in a new home. I think it's great that your aunt took in a kitty that is a little older (even though at six months, she is technically still a kitten).
I adopted my cat, Elvis in August. He was very difficult. We think that he may have been abused and/or abandoned in the past, and we know that he lived on the streets for a while. From day one, Elvis loved to sit in people's laps, but he didn't like to be touched or loved. He would bite and scratch sometimes. He had serious trust issues, and I was afraid he would never calm down. With a lot of patience and love, however, I have been able to show him that nobody is going to hurt him anymore and that he can start to trust. I am amazed at the progress he has made and continues to make. He will always be a tough guy, but he no longer bites or scratches me and sometimes he even lets me rub his tummy. He is very affectionate.
My point is that Dusty may just need a little time and a lot of patience. Some cats are just skittish by nature, but I think that they do tend to calm down when they get used to their new surroundings and to the new people in their lives. It may take months, but Dusty may slowly begin to come out of her shell soon. Just remember that it takes time, but it will be well worth it.
Good Luck!