Tiffany,
We do have a blog post about How to Solve Letter Reversals but it is pretty much what is also in the appendix of the All About Reading 1 Teacher’s Manual.

Helping a child overcome letter reversals or confusion can take time. If your child is still pretty young and new to reading, then I recommend gentle correction each time it’s a problem. When she misreads a letter in a word, build the word with the letter tiles and have her sound it out touching each tile as she says its sound. Make yourself a note to review that word both with tiles and by rereading that page where she made the mistake. This ongoing correction and reviewing should show improvement in a few weeks although it is likely to be an occasional problem even after that.

However, if she is older and continuing to have trouble with these letters, some more focused attention may be in order. Choose one letter to focus on first (I recommend d as it is more commonly used than p or b). Spend a couple of minutes a day focused just on that letter. The tactile letters and air writing may seem a bit silly, especially with an older child, but they are effective and I highly recommend them being a large part of your daily focus on letter confusion if this is an ongoing problem. For a couple of minutes a day, do air writing of one letter, trace a tactile letter, and focus on the letter and its sound. When your daughter misreads that letter during her reading lesson, ask her to air write it as she says the sound. Then have her reread the word. If reversals have been going on for a very long time, they can take a very long time to overcome. One of my coworkers worked with her daughter for a few minutes a day for almost every school day of her 4th-grade year to overcome her reversal issues.

I hope this helps, but please let me know if you have further questions or need more information. I’d love to hear how things are going after a couple of weeks.