Let her grow. When the hairs are almost completely brown and they actually start to wither. It seems like forever and everyday you want to chop chop. But every day they get a little better. Not enough to really see the difference but still better. If you take pictures daily of the same buds you can really see the changes over a three of four day period. That's the only way I've been able to keep letting them grow. Remember the plant will start to wither when its ready. Not just yellowing leaves but the buds start pulling inwards.