Not so that anyone would know right now. I think that for the extent of Phase 1 we should only work on getting enough silver for the girl and maxing one of either the slots/skills and not bother with the remaining of the skills/slots until Phase 2, where you'd have to run the new maps anyway to 3-medal them.
To sum up, if you see event bosses and you've already got her and one of her two upgrades maxed, don't waste any RPs on them until Phase 2 starts. These event maps aren't really worth running multiple times except if you need the silver...the same Ampys are available in a much more efficient way from 12-X.