Get her spayed and adopt a litter instead. Do you know how many kittens are put to sleep every day due to overpopulation?!
Well firstly your cat shouldn't get pregnant in the first place this is because the risk of infection and diseases transmitted by other cats who havent been neutured and have caught a virus for example the FIV virus and spreading it on. Theres a high risk that if you let your cat get pregnant it will catch an illness which can lead to death. You should get your female cat spayed at the age of 6 months old as it reaches puberty, there will be more information if you research on the interent this is because if its not spayed it will go out and look for another cat to mate with and can catch a cat virus, bad smells and odours will spread around the household and it becomes more arrogant and violent and makes them have more of an urge to fight which can result in broken bones and teeth and injuries around the body. Also its not your decision because at the end of the day the cat might get pregnant and not want to be she might not want to go through the stess pain or even being a mother you have to compare the fact to human physiology because its not your mate who says yeah get pregnant I want you to be because the mother might not want to get pregnant so the answer to your question would be to get your kitten spayed as soon as possible before these things may occur and I guarantee you if your cat isn't spayed she will have a low expectancy rate and high rate of death, and I'm sure you don't want that for your cat so take my advice and get her spayed and fast!