Congratulations on your new baby
We would love to see pictures. What did you name her? Thank you for adopting from a rescue group/shelter, there are so many kittens that need homes! Your cat is lucky to have you.
I only just stopped feeding Chloe kitten food and she is 11.5 months old. She has always been small for her age. When I adopted Matilda, the shelter said that she was 9-10 months old but she was definitely full grown (my vet thought she was at least 1) so I fed her adult food. GoldenKitty is right, you do have to watch what your cats eat because you don't want them to become overweight. Also, I would try to give her some wet food every day.
As for good kitten foods, I like Wellness Kitten (it's at PetCo). When I first adopted Chloe, I fed her Nutro Natural Complete Kitten, which is a good food for the price. Nutro Max would be a good kitten food too. Royal Canin's kitten food (not babycat, but the kitten #34 one) is another one I would recommend. Make sure to gradually switch her dry food over because cats have sensitive stomachs. (You start out by feeding mostly her old food and a little of the new food, and then as the week goes on you add more of her new food and less of her old).
Usually rescues can't afford to feed a really premium dry food, but their priorities are elsewhere. Some shelters have food donated from major pet food companies (the pet food companies want to help but I think part of it is that they hope the cat will keep eating their food in the new home). The place I adopted Matilda from received Iams dry food for free from the company. The cat rescue where I live gets all of the dry food free from Hill's (Science Diet).