I'm also short, (about 1.70 meters, don't how much it is in feet), and my hands are small on the same scale as my height. But I still can palm cards better then my friend that have rather big hands and still can't palm a card right.
It's all about practice, when I palm a poker size card I just really need to be accurate with my hand because it pretty much takes my entire palm.
So when I practice, I practice with poker size cards, and when I perform, I perform with bridge size, that way I have the skill from practicing as well as the confidence from knowing those are smaller cards.
And sometimes you just need to think of other methods. For instance in my kids show I produce a 36" silk, and no matter how I tried to fold it, I never could get it to be small enough so I can palm it in my hand, so instead I just hide it in my jacket and produce it with some misdirection from some flash paper.
Oh yeah, and don't forget, classic palming coins and other small objects is a lot easier with smaller hands than with big ones
