What, no, she disappears during the finale. Are you crazy? Disappearing mid season would be like having the kissing scene in ToraDora by episode 12. And episode 13 onwards would be about them standing around going "uh derp derp what are we going to do now?" while Ryuuji and Taiga make out every chance they get.
Actually that doesn't sound so bad. Maybe they can bonk by episode 25, or even get Taiga teen pregnant.
If AnoHana turns into a series about a necrophilic schizo, victory against Team Hanairo would be assured. The only way they can compete is if Pohana rapes Tsundere and Shy girl simultaneously.