From multiple reviews, the Ruger LC9 which has an internal hammer has a terrible trigger. But that's the model they make in all the pretty colors.
The LC9s and LC9s pro have strikers and reportedly one of the best triggers out there. The pro model has no magazine disconnect, so will fire without a magazine and no external safety.
The ideal would be go to a range where various types of handguns could be test fired to see what gun the lady prefers.
