Quoting Jennasmommy :" I had this issue when I was younger. I wrote from right to left and all most every one of my letters that could be backwards would be. Does she have a dominant hand?"
Quoting treann79:" I teach 4K and this is super common! Lots of kids will be writing their name correctly for awhile and then all of a sudden it's backwards. I just remind them and it will turn itself around "