Hi - it's been a couple of days and I was wondering how you are all getting on - has she settled in any better?
I would echo what Milly's Mum says; do you have the space to give her her own room or space in the house that is just for her? As she has spent such a long time in the cattery, she is probably not used to be in a house with people dedicated just to her. It is probably all a little confusing; no doubt for you all!
We are just about to adopt our 5th and 6th rescue cats. Whenever we have brought new cats into the household, we have kept them in the spare room for about a week (at least, depending on their known previous experiences and what their characters are like.) Cats number 3 & 4 came as a pair, to live with our existing cat. We put them in the spare room with litter tray, food bowls and beds/blankets and went in to spend time with them; usually just to read or use the computer or chat to them - luckily, they were very friendly and sociable cats and would come to us straight away which meant that we were able to get covered in their smell and tickle them under the chin (scenting area, apparently.) Then, we would leave the room and go straight to our other cat and tickler HER under the chin, therefore exchanging the scent. She would smell our clothes quite intently. We also used to swap blankets between the cats so they got used to one another's smell - and by the time they were finally introduced to one another, apart from some hissing on our older cat's behalf, they were fine.
It was a different story when we introduced cat number 2 to cat number 1 - when she arrived with us, we put her in the spare room where she hid under the bed for 2 weeks. I would go in and lie on the floor and talk to her but not make any attempt to stroke her - she eventually came out under her own steam and sat a little away from me - the distance decreased day by day (it took her 11 years to actually come and sit voluntarily on our knees, although she would sit incredibly close right next to you more readily.) I also used to hand feed her little bits of chicken and just sit and chat for hours so that she got used to me. It took a lot of patience!
I would also recommend the use of Feliway - we used the room diffuser and had no problems. It's not cheap but it might be worth a shot given your little cat's background. BTW, it specifically states on our pet insurance that Feliway is NOT reclaimable, by the way . . .
I am really hoping that you are all fine and that she has realised that you are doing all you can to improve the quality of her life . . . it might just take a little while for her to appreciate this. Please let us know how you are getting on . . . . .