I'm 5' 3" and I ride a 14.3hh arabian,and I actually think she is just right for me even if I sprout a couple more inches(PLEASE!!!) I think you'd be fine on a larger pony as my friend's mother rides her 14.1hh pony around sometimes, but he's a stocky, lazy thing. :) So you could even consider small horses too, unless you are set on wanting a pony. There are some cute quarter ponies out there pretty much anywhere that might do the trick. Good luck!
Proud owner of ~Mana: 6yo Arabian gelding~Pearl 13yo Arabian~Danzer 14yo Arabian mare~ Tiny mini filly