You know, when I have a volunteer who is planning on teaching as a career or a volunteer who already has teaching experience, I treat them as a student teacher, or at least take their contributions seriously. I'm not too impressed with that teacher for not acknowledging your experience and your insight as valuable.

I'm also not terribly impressed at the reading program you've loosely described here. Is there no guided reading for the kids? Is it all read a book, take a comprehension-level test, read another book, mostly independently? No wonder this kid is struggling, if so.

Kudos to you for realizing this child needs more than that, and for offering it to her.