She can just barely reaches and grabs the vial.....
She drinks about 1/2 the contents and the weight growth stops.
The bones in her arms and legs soften quickly and soon become rubbery and quite limber. Her paws disappear as a row of suction cups appear on the undersides of her limbs. She notices 4 new tentacles are now growing from her sides.
Soon her tentacles have stopped growing. She sees she can now reach more vials......