Mo'ne Davis -- Forgives Baseball Player Over Insult ... Asks College to Reinstate Him

Mo'ne Davis continues to show why she's the most mature 13-year-old alive -- we've just learned she reached out to the president of Bloomsburg University and asked him to reinstate the baseball player who called her a bad name on Twitter.

TMZ Sports spoke with a rep for Bloomsburg who tells us ... President David L. Soltz received an email from Davis and her coach in which they ask that Joey Casselberry's dismissal from the team be reconsidered.

Casselberry was booted from the squad this weekend after he posted a tweet saying, "Disney is making a movie about Mo'ne Davis? WHAT A JOKE. That s*** got rocked by Nevada."

The team said Casselberry violated the athletic department's social media policy -- and possibly the school's code of conduct.

While Bloomsburg says they respect Davis' opinion and praise her for being incredibly mature about the situation -- the school will NOT reinstate the baseball player ... saying, "Right now we're standing firm."

For his part, Casselberry apologized for the tweet and says he's a huge Mo'ne Davis fan.

After we broke the story, Mo'ne spoke with ESPN and explained her decision -- saying, "I know right now he's really hurt ... everyone deserves a second chance."