Pitchers come in all shapes and sizes, and you'll find successful pitchers at different heights.
First, the average height for a woman in the US is 5'4". It is pretty rare to see a 5'4" pitcher.
Generally, D1 pitchers are 5'9" and up. Just glancing at a few D1 rosters of UCLA, Arizona, Alabama, Missouri, and Michigan, the shortest appears to be 5'6", with most pitchers being over 5'9".