I would suggest she shoot both before deciding. I'm a former Glock owner (mod. 27-.40 cal.), but found it didn't fit my hand and actually caused a blister on my trigger finger where it rubbed against the frame when firing. Glocks are fine guns, but there is no one-size-fits-all pistol of any make. I presently carry and shoot a Springfield XD sub-compact, .40 cal, which is a much better fit for me. But, that's just me. Some ranges have rental guns for comparison while shooting them, which is preferable to just fondling them in a gun store. Good luck.
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