There are many girls who have done this before you. The thing that will come into play the most is your frame at 5'3", you might need some modifications to help your armor to fit comfortably. Or, if you don't want to mod the outside, I know another lady trooper who wears internal padding to fill out the suit from the inside.
Look at this build to see a suit custom fit for a smaller lady: http://www.whitearmor.net/forum/topic/25919-dianas-rs-props-build-anh-stunt/