Hi JDE, and congratulations on your upcoming wedding! Your gift idea sounds very thoughtful and romantic to me. To help us out with recommendations, I looked up the three fragrances you mentioned. Here are some descriptions I found:
LET IT ROCK
An oriental-woody fragrance with refreshing top notes of mandarin (or bergamot?) and freesia, a passionate heart of jasmine, and a base of patchouli and amber.
Beautiful anise note is a perfect match to licorice and violet. The intensive green ivy note is fresh and optimistic. The almond is in harmony with woodsy iris and sweet vanilla, united with heliotrope and tonka.
Fresh, youthful fragrance. Bergamot, grapefruit, and green notes of aquatic lily are united with fruity nuances of peach and melon. Heart is lily of the valley enriched with jasmine, rose and ylang. Warm base of sandalwood and musk.
So your fiancee seems to like oriental florals with a fresh, citrussy start. The Lolita Lempicka is the "odd man out" -- I haven't tried it (or any of these), but it sounds like a very interesting gourmand that is leavened by a fresh green note. It sounds like your fiancee likes some complexity in a fragrance, and is not averse to a little fruit. But we want to stay young and fresh, while making sure the fragrance has the "romance" factor befitting a wedding gift.
Hmmm... what do you all think that JDE might want to try?