L.C.
They're right, J. C. Nix is the only brand that kills the lice AND the nits, so even if you miss one it won't hatch and create a hundred babies. I, through my years of parenting and teaching, have become quite the headlice expert. Hey, some people do wine, we do lice, unfortunately. Here's everything in a nutshell:
1. An adult louse only lays about 10 nits a day. Websites that tell you it's thousands are trying to scare you into buying their products.
2. A nit takes 4 to 10 days to hatch, usually 7.
3. That baby louse takes 4 to 10 days to mature enough to lay eggs, usually 7.
4. They do not jump, only crawl, and cannot live off the human body for more that 72 hours.
If she only had 8 nits then you either caught it early or there was only one. Good news!!
I would go tomorrow and get the Nix and do a treatment as a precaution. Bag up the stuffed animals and put in the garage for 3 days. Wash the linens and put the pillows in the dryer on high heat for an hour, and vacuum the floors. Get the lice spray and spray down mattresses (paying special attention to the seams) before you remake the bed and be sure it dries as well as car seats, and furniture apholstery. Wash coats and hats and boil combs and brushes for 10 minutes.
She's probably fine, but this is one of those things that can be really inconvenient to be wrong about. Also, during the winter months when lice is at it's most active point, I would look up the cetaphyl method for treating hair and do it once a week on the weekend. Adults don't get lice because we do stuff to our hair like blow it dry, use flat irons and put in product. You might consider blowing her hair dry or using some kind of leave in.
Hope this helps!
L.