I wanted a breath of the wild Link and then i felt disapointed when the mod got released because of the moveset and the sprites also i can't do ssbu combos with it even though it is a good mod but it is slightly more powerful than a normal ssbc characters like captain falcon so in a nut shell even tho Rosalina may be added as mod she might be too powerful or too weak or maybe not the same moveset but there are other possibilities but they are low :
Rosalina will be Perfect as mod
Or it'll be added in the next major update (probaly 3 years from now)
Also sorry for to much yapping thx :)