I thought the first Morgan that was in the first 2 seasons was outgoing and talkative the second Morgan from seasons 3 and up had no personality. She just had one liners and she went up to her room the rest of the episode?

From what I understand that the first Morgan simply hated being on TV at such a young age (and it had NOT been her idea) so after a while the show's producers agreed with her and let her go and recast the part.

Lindsay Ridgeway, Morgan #2, was really pretty. Unfortunately the writers hated Lindsay and didn't give her good material like Lily Nicksay got.