I'm not certain she even had a ribbon. I don't have her or any of her set MIB but looking at other MIB images from her set online, they only seem to have combs. The Summer Wings have the metallic ribbons like the first year and some second year flutters, not the Windy Wings. I think you are free to choose the colour you want for Moon Jumper.
If someone has any of the ponies from the set in box or them MIB they will be able to check the top of the box to see if a ribbon is listed there, but I have gone through six or seven MIB images of others from that set and none of them look like they have ribbons.
Edit to add - I found one box photo where I could just about read the text - it says the pony and hair pick. No ribbon mentioned. That is for Starry Wings not Moon Jumper but it is unlikely one would have a ribbon and not the rest (unless it's a nirvana or variant like the one Skeen mentions)