Uhmmm....

All you got to do is go to the new set of galaxys to the left side of the main building thing whatever it's called

She just wants you to reunite with them. On Loopdeloop Galaxy, all you need to do is focus. Go slow if needed, just not too slow. Be really careful on turns, and make sure you have enough 1-ups to help survive just incase you keep dying. Hope this helps!

Just to re-unite with them really, that's all, just continue the game as normal after that, and Loopdeloop Galaxy, just be patient and have plenty of 1-Ups spare, don't go too slow, you will get it in a while, it just takes time.

All you have to do is go talk to them. In loopdeloop galaxy, you just twist your wrist in either direction to turn, and you can't fall off or you die. All you really have to do is finish below 1 min. 30 sec. But thats not a problem, because the first time I finished it I got 1 min. 09 sec.

Just go slow on loopdeloop galaxy make your turns as small as possible.

Just talk to the toads, nothing will happen. And for the loopdeloop galaxy, move slowly on curves and move fast on straight lines to save time, and make sure to collect many 1up mushrooms for your awaiting adventure...
Hope this helps!