Fimbrethil is really too stupid to be allowed to stick around. As evidence, she chose an idiotic spot for her gardens- too close to Mordor. If she had any brain at all she'd have had the sense to move someplace safer once Sauron grew strong. I rather expect that she was purposefully putting herself in harm's way in order to lure Treebeard and the other ents out of their woods. If we get rid of Fimbrethil, it will allow Treebeard to give his full attention to winning the game.
++Fimbrethil
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