A lot will depend on her: is she shy, is she playful, is she comfortable with strangers? A shyer cat might feel safer for a day or two in one room where you can spend quiet time with her.
I also think cats warm up most easily to people who don't push too hard too fast. Sitting in a room reading with her and allowing her to make the first move might work best. But I think you'll know: if she comes up to you purring and headbutting, you won't need to take it slowly at all.
My cats all love those Temptations treats. Interactive toys like feather wands are good. Catnip toys are good, although if cats are exposed to catnip daily it loses its effectiveness.
Mostly, just trust that you are an animal lover and she will be pick up on that. She'll be grateful and loving, even if it takes her some time to get over her anxiety about a new location and her grief about losing her old family.
You're a good soul for taking her in. She's lucky to have found a good home.
Edited to add: if you can, use the same food she's used to, at least for a while.