Gelidkinesis is the power to turn water and all things that contain water into a gelatin-like compound.
Bella also shows the ability to change water's viscosity (making jelly to catch Cleo's fish and turning water into a viscous compound). In the episode "Queen for a Day", Bella's allergic reaction affected her powers, and when she sneezed it caused every liquid in the room to become gelatin. A user of hydrokinesis can levitate this jelly-like substance. A user of this power can cause the jelly-like substance to explode.
It was also shown that, if Bella wants, the water will return to its normal state after a few seconds, but if she doesn't want it to, the water will forever be gelatinous.