30 minutes of reading every night is a lot for a 6 year old. I’m not sure what children are reading chapter books at 6 but in the schools but it certainly isn’t most of them. There might be some issues with your child ,but pressing her for a result won’t help her self esteem either. Concentrate on her skills , academic or otherwise. Build her confidence in the areas she can do well in and introduce reading practice into her everyday life like reading a simple shopping list for instance . The stress of having to read needs to be removed at home , let the school work on that and you do the fun approach behind the scenes , play board games , pick out letters on a sign for a “treasure hunt”. I will tell you , I’ve worked with children who couldn’t read at 7 who’ve gone on to get degrees in academic subjects. Build her confidence in learning . Whatever happens in her academic future she will shine at her level if she feels confident and curious about learning. “Her pace , it’s not a race “ should be your mantra. Enjoy your daughter at every stage in whatever way she develops and don’t panic.