She can make gelée :) then turn it back to water. She can also harden the jelly, so it's like ice except it doesn't melt. The pic is bella's power working it's magic!
Isabella Harley's has 3 different powers than Rikki, Emma, and Cleo because she became a mermaid in a moon pool in Ireland, not Mako. (Hydro)Gelidikinesis: changing water into a gelatin (Hydro)Substanciakinesis: changing water into either a solid, dark/rick looking substance, ou a glass/crystal looking solid (Hydro)Mecokinesis: causing either the gelatin, solid, ou normal water kind of "explode"