I have taken in and socialised 29 or so "stray" cats and kittens over the past three or four years now, that we assumed were flood victoms. I have learned by doing, that most of them were offspring of strays or kitties that have been "dumped" on our street or down below us in the post flood areas.
We start out by putting one kittie in a spare room. Than I give them a few hours to adjust to the room. They have plenty of places to hide, but no place that I can't reach in and pet them. I take a small amount of meat food mixed with lots of dry food to them, sit in the middle of the floor and call to them. Meat food generally brings them out, altho I have had to resort to canned tuna fish. (Very little tuna mixed with lots of dry food.)
I pet them right behind the left ear, kinda up the side of the shoulder blade, very lightly, like their Moma would, to encourage them to eat.
Once they have eaten I will just sit there and pet or brush them and let them determine how long they are going to let me touch them. Once they walk away, I leave the room and come back two hours or so, later. I bring meat food, always and let them adjust to me.
I have my husband go in with me the second day to see how the kittie reacts to men. Men are more likely to have used their boots to "boot" them off the porch. If it is a fearful reaction, I will have my husband bring in the meat food the next time, say an hour later. Than he and I will sit together, quitely and he will feed the kittie and stroke it's neck.
They learn in just a few days that men and women and most people are ok.
After the third day, I generally have them lying down beside me to be brushed with a brush.
Most females are more finicky about getting into your lab and allowing you to hold them. They are just more independent than the boys.
Most boys I have had will get into your lap in three days or less. They crave the attention more than the females.
After three days or so of spending longer and longer periods of time in the room with the kitty, (30 minutes at the most, than they want you out), I put it into my largest carrier and take it out into the hallway. We sit and look
around. Little by little we work our way to the living areas and have it in the room with us, in the "safe" box, and let it see the house.
I have other cats and dogs and parrots that I have rescued, so I give this kittie time to associate with other animals.
Being alone kittie, you will become it's community. But, remember, females fight for the right to be top producer, the "Alpha Female" and may feel threaten by you as a female, in the environment. So, never look her directly in the eyes. Don't try to hold her in your lap for too long a period. (Hold her a litlle longer and a little longer each time, but when she gives you the sign she is ready to leave, let her go.), she will feel less dominated.
I let my kitties out of the room after five days. I open the door and let them explore. Most of the time they check out the hallway and dash back into the room. I let them go and close the door half way and let them come out on their own.
They generally sniff and rub everything so they can find their way back into the "safe room" if they need to run and hide.
But, let her do that. She will come around, it will just take time and patience. Girls are more finicky than boys, so don't get discouraged, just take it one step at a time and let her come to you.
You'll win her confidence, don't worry...she'll be fine.
Enjoy and let me know how you are doing.K?