came across a book by former president sadats wife in virgin a few weeks ago.

There is a chapter covering the issues in trying to get the first female judge. They suceeded of course and there is no issue with sharia. The excuses was that a woman was too emotional to be of sound judgement to be a judge, despite the fact that a woman can raise a son to be a judge using the very same emotions.

No where does it say that a woman cannot make judgement,
just a patriach society that doesn't like to let go.

My only concern is that such a judge must be on pure merit and not a token gesture. She also be better be very good because she is going to have to prove herself twice as much as the men to counter those who resent a women in such a position.

I say .. give her the benefit of the doubt and good luck.
will it boost gender equality? in the short term no, in the long term maybe. it should be seen as a sign of long term change. Qatar has too small a native population to use gender as a barrier to filling the necessary position with the best people.
Use gender to obstruct women and you automatically lose 50 % of the talent pool. Something Qatar cannot afford.
countries with larger populations have already realised this.