I don't think you need to take the hair... I thought you just needed to kill the Baron???

After picking up her hair, Jaheira tells you that she should be all right after a good night's sleep. She is actually wrong about this--her curse takes a full 12 hours to wear off, not 8....and it doesn't even matter if you sleep at all. But yes, putting her Hair in your Inventory is what lets the game know that the quest has been finished. After Jaheira says her piece, the Hair is useless.

<FONT FACE="Arial" SIZE="2" COLOR="#00ff00">i did 3 sleeps in a royal room to get rid of jaheiras curse.</FONT>

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This is what i did..
1)found and killed Ployer
2)picked up hair (in Jaheira's inventory)
3)placed hair on ground after checking it out,decided it was useless and left it there.
$) jaheira said she was feeling better.

<FONT FACE="Arial" SIZE="2" COLOR="#00ff00">yes, thats what u supposed to do, but u dont have to put jaheiras hair-lock in jaheiras inventory.anyones can too.</FONT>

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Jaheira says she'll fell better after one day of resting, thats resting x 3.

it worked fine.thanks.