A late bloomer like Jiangyu, very expensive to make her work. The more dupes you can get the better she will be but not really worth to pull cause there are better investment for water later.
V3 and V6 are the breakpoint for her to heal when dolls attack a target, better damage and get a team teleport.
Somewhat fixes her low damage and helps with her skill point gain, but you should only get this after getting some dupes or having a built Springfield/Tololo combo.