My oldest niece "read" upside down books when we used to babysit her, she sat at DH's feet and copied him while he read. When she heard him turn a page, she looked up at him then turned her page too, and pointed to things and ran her fingers under the sentences. She did this when she was pretty little, 18 months.
My DD read her books upside down, or upside right, didn't matter (also did mirror writing and writing letters backwards...still has issues with d/b) through the summer entering 2nd grade. You could ask her to read it and she would. I guess the placement just wasn't an issue for her. Font also never an issue. She was not right-left dominant until last year really. Can't tell left from right, still, though, this takes some strategies! Is very good with physically placing herself though, she always knows which way to turn when she comes out of a store, gets floor plans at airports and malls down very fast.
She is just good with visual things, did jigsaws early and also did them blank side up when she was bored with picture part.
You should keep an eye on it of course and keep reading lots of articles and research, but IMHO at such a young age it's hard to tickle out the natural learning strategies they are coming up with on their own and learning issues down the line.
