Would a 14 year old female that's 5'0 feet tall still be able to grow more? if so, will there be a big change in her height, or a small one?

It depends: upon whether or not she is still in a growth spurt. Also need to know height of parents to estimate adult height.

Possibly/not much: Most females will finish growing taller between 15-17 or 3 years after their first menses. Her expected final height would be the average of both parents less 2-3 inches.Without having any of this data it is hard to project her expected outcome.