I was just watching season 1 of Pretty little liars again. And i thought of something, Mona was really so unprofessional as A during season 1. She did things for her own benefit and it wasn't as serious as it is now. In episode 10 of season 1 Mona planned her birthday party "Camp Mona" and she gave invitations to the girls. After Mona left, the girls said that they wouldn't come to the party and right after they had said that they got a text message from A saying that Camp Mona is a scavenger hunt and that the liars should come and find A. So Mona sent this message because she heard that they weren't coming to her party and by sending this they would come. Also A saved Ezrias relationship in the same episode, now why did A do that? Well as we know while Aria and Ezra had their short breakup Aria dated Noel. I think Mona was into Noel already back then and she saved Ezrias relationship so that Aria would dump Noel. And than when Noel wanted to reveal that Ezra was dating Aria A ratted out Noel and said that he was cheating on tests so he didn't have the chance to rat Ezra out. Mona did this because she knew that if Noel revealed that Ezra and Aria where in a relationship Aria wouldn't be allowed to date Ezra and there would be a big chance that she got back with Noel. Noel and Mona dated later on and when he broke up with her she seemed really sad so she probably really liked him.
Also in that episode Mona was angry at Hanna because she wasn't spending enough time with Mona and later on Mona said that she got a text message from A saying that Hanna got a liposuction. Mona was the one who sent this text and think about it, Mona did this because she was angry at Hanna, that's nothing A would do today. Mona was such a amateur from the beginning, so what does that mean? Was Mona a new member of the A-team during season 1? When did she become so serious about her work? Was even the leader (big A) serious from the beginning? So many question and only a few answers.