Having kittens at 6 months could kill your kitty! She is not physically or emotionally ready to care for her young.
Are you able to take her to the vet if a kitten gets stuck and she needs a c section?
If you cannot afford a vet to get her fixed how will you be able to house and feed the kittens? It only costs around $50. to fix a cat at the humane society and you could make that much with a yard sale!
How will you know if the people aren't using the kittens as pitbull bait? How do you know if these people won't throw the cat out after a day or two? What about people that just enjoy hurting helpless animals?
I know you want what is best for your kitty and would never do anything that could hurt or endanger it. I know some newer folks here came on a little strong too.
Please don't give up on your little one as she could be sick. The humane society is available to help you with your kitty. Please give them a call and let them know you are worried that your kitty may be ill and you don't have the money right now. They may have programs for this situation and will give you the treatment to pay in payments.
Please keep me posted as to how your baby is doing, and please bring it back in as it could catch illnesses from other cats, be mauled by dogs, hit by a car or stolen. Keep this precious bundle safe inside.