Oh gosh, the days of boiling the brushes and combs---oh the memories!
Yes, a flat iron will work too. Before I did the coconut shampoo/conditioner, I tried that. My daughter has very long and curly hair too and it was a mission to do with her. I also did not like using it on her hair because she is so young and I felt like I was damaging her hair. I still had lice after, probably ones that were on the scalp that the flat iron did not get to. It did help though.
I am glad it worked for you and your daughter is lice-free! Anything to get rid of lice is always good! I prefer the coconut stuff. Not only did it get rid of lice and the eggs but it repels them and makes her hair smell and look great too. Not to mention-it helps with her tangles. Gotta love thick, long curly hair.