I was 5'2 in the 4th... TOTALLY empathize with you. It's doublly hard, because MOST little girl's clothes are actually on the sexy side, but when your little girl isn't so little, you *notice* that. Instead of "ohhhh, how CUTE" it becomes "WHOA...waitta sec".
For both now and later, I HIGHLY suggest UK clothes. For one, their sizing is better, and 2nd, they're classier. MUCH less Britney Speares than American clothes. Yes, they are pricier than target, but I've been shopping both of these stores for 5 years (for my son from Boden, and myself from Sally), and the clothes last until my son GROWS OUT OF THEM!!! and are still in good enough condition (usually) to hand down. Not even gap comes close for durability (my son is adhd, he puts his clothes through the wringer).
http://www.bodenusa.com/Girls-Clothing.html and the teen version is here
((MAJOR trick with boden/miniboden/johnnieB... only order 1 item. Once you're on the mailing list you will *never* pay full price again. Their 3 most frequent deals are "Buy 3 get 1 for a penny" and "$25 dollars off your order of $125 or more" and "20% off". I try and wait for their buy 3, because it's the best deal, but it only happens 2 or 3 times a year.))
And where *I* shop for most of my things (a 36" inseam is almost impossible here in the states)
((One more hint for later on... here in the US... I also shop in the pregnancy dept for tops. Because they are LONG enough to cover my navel, and no one is going to know the black camisol is actually a pregnancy camisol unless the read the tag. BUT the durn things have a good 4-8 inches of extra length.))