The best bars for small hands that work great with shimano shifters - I know since I use that combo - is the Easton EC90 Equipe in the pro bend. The only problem is that Easton stopped making them last year!! Not enough demand was the reason cited. When I heard that, I scoured North American mail order shops and managed to find three spare pairs which I will guard zealously.
If you can find a pair, they are the ones for you!!