TK6043 is 5'4", 120lbs and also wears size 4 shoes. She wears AP armour and painted jodhpur boots (from a riding equipment supplier).
The armour is assembled using the original seam lines, i.e. no extra trimming to make parts narrower to fit closer. The only extra trimming is in the areas at the back of the knees to allow more freedom of movement when walking and around an inch trimmed off the chest plate (Luke-style) to compensate for "short trooper syndrome".
In my opinion it's better to maintain the original lines of the suit as best as you can rather than adapt it to fit a female shape. The sculpt of TK armour is essentially a masculine shape. Changing it to follow a woman's shape will change the character of the outfit.
Yes, there is a little more room inside in areas like the shoulders and biceps - where men are typically broader - and less room around the hips and thighs - where a woman has her curves - but a good strapping system keeps it all in place and comfortable.
Something like AP, which is suited to a slimmer trooper, would make for a good choice.