Ok, OP here to stand up for myself and my parenting choices...
I did say "challenge" - because, erm, that's what I meant - but, not because I want to croon "oh, has your child not finished Biff and Chip yet?"
Having a chronically ill brother means that you are continually overshadowed. That can't be helped, I do my absolute best, and, it's never going to be enough until I can get the day to be 36 hours long.
I'm looking for ways for her to have an ego massage, and to be "famous for reading" (I haven't given her Ms J's Prime) because her peers will value that, and, the child needs every bit of confidence she can get. Just like anyone.
She's not the sporty one, she's not the smart one, she's not the pretty one, or the funny one, she's the reading one - and, there's not a damn thing wrong in me noticing that, indulging it and celebrating it. And, of course, part of me wants to stretch the "lead" she has on the #2 Reader in the class, because, once she's "overtaken" she'll lose her fame and, she needs it for the time being.
No, of course reading does not need to be challenging. But, if you get a kick out of being seen with Big Books and your teacher notices that you're reading classics, and your vocabulary is stretched because of the breadth of your reading - and, importantly, you learn that you are GOOD at something, what's wrong with it?
In my mind it might make up for all the tearful struggles with her x4 table. AND, I can reward her for good or thoughtful behaviour with "oh, here's a book you can get your teeth into", which is like catnip for her.