She absolutely needs to be looked at. In most cases, Moji players are rewarded by simply holding left+right click as they run around, and the range of her flamethrower allows her to build up that little star meter without issue.
Combine that with a dash that lets you get out of danger at such high speeds or the barrier which she can heal from, she's an absolute nightmare to deal with.
I wouldn't mind her damage output so long as the range of her thrower was cut down, or at least given a cooldown meter much like Grohk's staff. Even disabling the ability to use it while holding down left click would make things a little easier.