Buell blast has a 25″ lowered seat option. That puts it lower than some cruisers.
If you like cruisers, then pretty much they all will have low enough seat heights for you (or have lowered seats available), and their centre of gravity is so low that they are uber easy to keep up.
A buddy of mine has the new Ninja 250 and is roughly your height, he has no problem sitting on it.
Really, there are a lot of options for smaller riders when starting out.
“The two seconds between ‘Oh S**!’ and the crash isn’t a lot of practice time.”