We have never pushed early reading on our kids but DD did learn her letters in preschool about two years ago. She's now 5. She's been steadily practicing them since, but she still writes most of them backwards (mirror images) and doesn't seem to grasp the concept that we read left to right, and down the page. She will just write letters in any order, and often mixes up letters completely... And she's actively trying to learn the letters now for quite some time. (Her desire, not ours.) She also will start out writing letters somewhat OK (like if she's tracing it, it's fine) but once it's her turn to do it, she will just kind of make squiggles a lot, mixed in with some real letters.
Same with numbers. She can easily count to ten and answer what comes before and after four, five, etc., but she can't write the numbers in order on the paper.
FWIW: She's also extremely creative and artistic. She's very bright and is an amazing storyteller, draws stuff, etc. She has very good listening comprehension and a great memory, can recite poetry, etc. We've also read tons together and live a very book-centric life.
Is it too early to worry about dyslexia and hope that in time she'll catch up, or are these throwing up red flags?