Heya, I'm a short surfer too, and I find my egg brilliant to use- very stable & picks up tiny waves.. last time I managed to pick up nearly every wave I went for.
I'd get 7ft if I were you. I'm 5ft tall and have a 7'2" board- great length for me. I think anything under 7 ft would be too short for you.
I don't know what the official definition of an egg board is, but I've come to think of them as wide minimal/short longboard kind of things!
Hope this helps x