Has her teacher's recommended any achievement testing for a learning disability such as dyslexia. If you are writing from the U.S., you may be able to request an Individualized Education Plan (I.E.P) to have your daughter tested for academic achievement. There, a school psychologist would be able to make a determination regarding any learning disabilities and make recommendations.
Here are the following symptoms to look out for: delays in speech, slow learning of new words, difficulty in rhyming words, as in nursery rhymes, low letter knowledge, and letter reversal or mirror writing. Although her teachers discouraged testing until the 3rd grade, I urge you to advocate for your daughter to be tested. The sooner you catch this, the better the outcome will be as children learn language easily during the early years.
THE ONLY SIGNS THAT I SEE THAT YOU MENTIONED ARE THAT SHE SOMETIMES MIXED D WITH B.THE OTHERS NO BECAUSE SHE KNOWS THE LETTERS OF THE ALPHAPHET AND NUMBERS.
Great. How is she doing in terms of her grades at school? Please let me know if I have been able to answer your questions.