When Can I Get My Kitten Spayed?

my baby is 12 weeks old. She is the only kitten in her litter, but they all have been spayed/neutered at 2 months of age. They are now 8 weeks old. Is it too late to get my kitten spayed? I really dont want another litter of kittens unless i can help out with them or if i need more than one cat for company..

Suggestions please..