In Lapis Lazuli's initial appearance outside of her mirror, she demonstrated a great deal of power over water, able to lift a quantity of water miles high, wide, and deep (to judge from the driving time to her tower). She was also able to control water duplicates that could fight quite effectively from atop her tower of water.
However, in later episodes, Lapis Lazuli has demonstrated a much more modest control over water, manipulating quantities perhaps the size of modest-size buildings (the water bubble surrounding the barn, for instance).
Obviously, out of universe, antagonists often become less powerful after joining the protagonists, but frequently there's an in-universe reason. Has this apparent disparity ever been canonically explained? For instance, does it take her longer to lift large quantities of water, or did her strength peak after being freed from her imprisonment?