Ideas needed to help child with letter reversals i.e. b and d?

My dd is 12 and has had a life long frustration with letter reversals. She confuses her “b“s with “d“s and her “g“s with her “q“s. She can go for long periods without reversing them but then she’ll insist that a “b” is a “d” or a “q” is “g”.

She had a LOT of problems learning how to read, but she can now. She is very right brained. I have long wondered whether some visual behavioural therapy would work..but we don’t have ophthalmologists in our town who even know what that is. Let alone practise it.

I am reluctant about doing a lot of drill work with her as drills tend to frustrate the heck out of her.

Does anyone have any ideas on what I can do to help her? Is this something she’ll just grow out of? Or, will it plague her the rest of her life?