WELCOME!

The fact that she is coming closer means she is progressing. And YES, it takes quite a bit of time to totally be trusted by a former feral.

To be the least threatening, stay low to the ground. Lying on the floor is the best way to start. Or at least sitting on the floor.

Food/treats are your friend. Give he what she likes to eat and let her KNOW that it is coming from you can be a great help.

Don't always give her direct attention. Do other things in her presence so she can watch and learn that your actions/movements mean her no harm.

Earning the trust of a feral can be totally rewarding. Give her time, you will be surprised one day at just how far she will come.