Best thing for knots is to wash their hair, towel dry then put lots of conditioner on it and comb through with a wide toothed comb then use a normal comb until all the knots are out (before going onto the nit comb). I would also make sure her hair gets a good trim, split ends create nightmare knots! Good luck!
its getting the knots out that is worst then anything.
When my grandchildren were in school in Wales nits were a constant problem. My daughter would get rid of them and a week or so later they would have caught them again. They did not have this problem in the States, nor do they now in Estonia. All I can think of is that the schools are not as vigilant in the U.K or that the climate is favorable for the critters..
wash everything, bedding clothes toys...keep combing her hair with a metal tooth comb they dont like to be disturbed a lot, wash her hair a lot..just keep going.. very often it gets wearisome and you stop and they are back.She may also be reinfected from a friend or school .
Buy some Nix or Rid it will help you so much. Also make sure you are washing the sheets in your house, and disinfecting your combs and brushes in rubbing alcohol.
Take heart - nits are a pain, my daughter had them last summer but they can be treated.
There are some sites with useful advice:
http://www.usatoday.com/news/nation/2009-06-15-lice-how-to_N.htm
http://www.nitmix.com/get-rid-of-head-lice-remedies.htm
But you need to go to the drug store and get a product that they recommend for removing nits. It will probably be something you apply to your daughters hair that makes it slippery so you can comb out the nits easily (don't try and comb them out on dry hair - it hurts!). I ended up cutting my daughter's hair by 2 inches as it was so long and that helped.
After following the istructions on the bottle, comb the nits out carefully with the nit comb provided by seperating the hair in sections so you know you have combed all her hair.
Some products recommend you do this again a week later and some not. But I would recommend (what really worked for us) that after the initial treatment is EVERY OTHER DAY to wet her hair (or wash it) then dry it thouroughly with a towel - apply a lot of conditioner and just use the nit comb to comb through all her hair (dividing it in sections again). Do this for at least 1-2 weeks (so you get all the eggs/nits and can be sure they have gone) until you see nothing left. Make sure any towel's are washed hot and her bedding is thouroughly washed hot after the first treatment and every week after that and her hair brushes are also regularly washed in hot water.
Then the main thing for her to do is ALWAYS wear her hair up at school if it is long. This will help prevent her from getting them again. You should also regularly check her hair and ask her if she's been itching (I do this about twice a month) because the earlier it is treated, the easier it is to get rid of.
Nits are a pain!