Acutally I somehow can understand her "WHY NOW".
In Manhattan Manhunt, she was a rookie in NY team, it was a new start for her, so she intentionally put the tragic things and memories behind, it could work for a short period of time, if she made her mind to do so.
Then later S2, there was the Mermaid case, the victim was from Montana, looked like Lindsay was affected by the case, I think the case brought her back to her hometown and old memories.
Then the Suicide Girl case and the grief and angry monther of the victim, she couldn't handle it (and so Danny got a slap on his face..)..At the beginning of that EP she stared at the dead girl for long time until Mac called her twice. I think the dark secrets were coming back to haunt her little by little until 3x12 she saw it again and couldn't take anymore.
However I noticed these mostly because of Mac's reactions, not Lindsay's. I feel that Mac knew all about Lindsay's dark secret in very detail (and seems he didn't tell anything to Stella, ), so he knew she might be affected by some cases and he kept an eye on her.
I hope there will be a conversation between Mac and Lindsay later to reveal more.
In Manhattan Manhunt, she was a rookie in NY team, it was a new start for her, so she intentionally put the tragic things and memories behind, it could work for a short period of time, if she made her mind to do so.
Then later S2, there was the Mermaid case, the victim was from Montana, looked like Lindsay was affected by the case, I think the case brought her back to her hometown and old memories.
Then the Suicide Girl case and the grief and angry monther of the victim, she couldn't handle it (and so Danny got a slap on his face..)..At the beginning of that EP she stared at the dead girl for long time until Mac called her twice. I think the dark secrets were coming back to haunt her little by little until 3x12 she saw it again and couldn't take anymore.
However I noticed these mostly because of Mac's reactions, not Lindsay's. I feel that Mac knew all about Lindsay's dark secret in very detail (and seems he didn't tell anything to Stella, ), so he knew she might be affected by some cases and he kept an eye on her.
I hope there will be a conversation between Mac and Lindsay later to reveal more.