Socializing 6 mo old kitten, left alone since birth

I have a kitten to foster (will probably keep her) that was found in a house with no heat and had been alone for probably 3-4 months at least.
She is friendly to me, and likes me to pet her. She does not seem overly afraid of my other cats or the dogs. One dog has licked her face several times, and she seems fine with it.
She hides almost all the time, except when I bring her out of hiding place to pet her. She eats and uses the litterbox.
I am wondering if I should let the door of her room open so that she can see the other cats walking around. (she was found in the empty house with a very large dog and other cats and one other kitten)
What is your advice?

I recommend a slow introduction. Don't leave the door open, because there needs to be a physical barrier there to make all the animals feel safe. Let them sniff each other under the door, or open the door a crack and get them used to each other. I would go extra slow just because you don't know how well socialized thiscat is and it could freak out very easily.

www.harpofhope.com helps immensely in situations like this. I play this every time I am in the room with the semi feral kittens. It only took 24 hours but they are now coming out and playing when it is playing.

Aren't you a love for rescuing this baby. It's a miracle the animals survived! I can't even begin to possibly write what I think of people that DO such things to animals.

hissy is our most experienced rescuer. I do know harp music has helped MANY scared, especially undersocialized animals. If you can afford it, I think you should try it.

But this little one has been traumatized. She obviously likes being petted... or is she just tolerating it? It will take her some time to trust. We don't know how long she was left alone, but she needs time to recover from having been abandoned by her people.

Have you adopted her or are you fostering her?

For now, I would not open the door. She needs to make that space her own. The first step, really, is her feeling safe in HER space. If you've adopted her, I would just talk a LOT to her, and explain to her that she will never be left alone again, and this is her home. If you are fostering her, I'd just keep explaining to her that she will never be left alone again, and you want her to know love, and to be able to trust people so she can find her purrfect furrever family.

I'd do things like.... get a Feliway diffuser going (if you can afford it). Put Bach's Rescue Remedy drops in her water. Get a t-shirt really good and stinky, and put it in a cozy bed you make for her in her hiding place. Maybe even get another one good and stinky and put it under her food dish. Feed her a wet meal or two at the SAME TIME every day. Clean her litterboxes at the same time every day. Clean her water dish at the same time every day. Get a set play time (if she can be drawn into play with an interactive toy - she may not know what play is yet, but give it a go. You may have to try the Neko toys (the ones that look like bugs) if she doesn't "know" play).

Especially for kitties like this, the more routine you can get set, the better. It helps promote safety and security.

Otherwise... spend as much time in there as you can, ignoring her. Read out loud, sing, fold laundry, work on a laptop, sew, knit, write christmas cards - whatever you can think of to do. Letting her get used to you being around and not always trying to interact with her combined with caring for all of her needs on a very regular schedule AND the stinky shirts with your smell associated with good things, and that "trust" switch WILL flip.

I can't offer better advice than what you've been given but wanted to welcome you to TCS and say "thank you" for taking her in