Most commuters are well served by a lightweight, non-suspension hybrid or flat bar style of bike from any of the major manufacturers. In the mid-price range there isnt a big difference between brands. Trek, Specialized, Giant etc all make women's models which usually have a women's saddle.
New riders really need to buy from local bike shops where they can get advice on sizing, correct fit and post purchase tune-ups. Not all bike shops can offer that advice, many are just box-shifters.