K.K.
I hope you can take your kitty into the vet soon. They may offer some kind of medication she should be on for several days as well as something like Frontline. It is possible she could have been carrying the tick for two weeks. Ticks I think live up to 1 year.
I once had a tick on my stomach below my belly-button and I had to have someone remove it. I had to also be on medication for 7 days. Don't freak out! Ticks happen and very often especially if you have active kids who love to go outside in the woods!
I found this online, not sure if will help you....
Find Answers for: How Long Do Ticks Live?
A tick for the most have a life span for approximately a year. However, the lifespan of a tick usually depends on the type of species that it is. Their life could be described as four stages, namely, egg stage, Larval or Seed Tick stage, Nymph stage, and lastly Adult stage. At stage they hatch their eggs which later moves into the second stage as 6-legged larvae.
The larva generally feeds on animals fro about 1 week to 8 months. After this stage is complete they move into the next stage that is known as 8-legged nymphs. They feed on animals for around 3 to 11 days and then a month later they molt. From here they go ahead to form a complete adult. After this they move into the next stage, wherein they put in their mouths, connect to their victim, and puff up themselves with a blood mealtime.
Good luck and don't stress too much!