Luckily you can ask for five samples at a go and get a little card with a bit of each stuck on for an in-person look when it comes to the things you're stuck on, and you can also request to have two shades blended, but just eyeballing things as best I can (looking at the nylons only right now)...
Yellow streak: 'Lemon Drop' might be your best bet, though it's hard to be certain. 'Lemonade' looks too light and 'Butterfly' too dark.
Orange streak: 'Tigerlily' is a possibility, but could be too dark. 'Nectarine' might be too bright. 'Sunset' is definitely too pinky.
Red streak: 'Sugarberry' might work, since RD's red is on the cool pink-y side (I guess to better contrast against the orange). But it might err too far on the pink side. 'Candy Apple' could be the closest, I think 'Cherry Pie' is too dark and 'Firebird' is too neon and too warm/orangey.
Green streak: You're gonna need to blend to get this one, 'Envy' with either 'Key Lime' or 'Sour Apple Martini' might even out...
Blue streak: 'Bobby Blue' is the only nylon that looks remotely like RD's. It's a bright, warm blue-- a little too much, but a tiny bit of 'Forget Me Not' might temper that out if blended right. 'Forget Me Not' on its own is too cool and not bright enough. 'Lapis Sapphire' is too dark.
Purple streak: 'Ultraviolet' is closest. It's not quite dark enough but the darker ones are VERY dark, or go too warm. ('Vineyard Violet' in saran looks better, but if you want her to be all one type I think you'll have the most luck with nylon for all the others)