I have nothing against teaching a child who WANTS to learn to read at an early age. The key being if the child wants the help. Just to keep in mind that it might be slow going at first and that it isn't a big deal if a child doesn't read until they are a bit older. I like the suggestion that you keep a book to illustrate the progress she has made.
But I have seen many parents who PUSH their child to start reading at a young age who aren't interested, and schools that push reading earlier and earlier to no major gain on the kids part. I had numerous parents in K want to know what "magic" I did to get my son to read. And I really didn't have a good answer.