Remember, I am talking about an 8 year old and not a younger child. If there is a word she doesn't know, she can often easily figure out the meaning from the context. If she thinks she knows how to pronounce it, there is no need to look up the pronunciation. So sometimes she does learn the wrong pronunciation, but I think this happens to anyone who reads a great deal and learns vocabulary that way. It's just important to pay attention and make corrections when needed. I don't think it suggests she isn't understanding well enough or shouldn't read that material.
