There is lots of choice, and she's unlikely to be disappointed whatever she gets.
But maybe there's something specific about her or how she wishes to use the bike that may sway the decision, or at least rule out particular bikes.
A few things to think about are:
How hilly it is where she plans to ride? If very, then be sure to have a good low bottom gear (but most hybrids do anyway)
Does she plan to carry anything? Make sure it has mounts for a rack. Again, I think most do, but worth checking. (or maybe a bike that comes with a rack).
What surfaces is she planning to ride on. More off-road calls for bigger tyre clearance. Say 35mm. Again, most hybrids are OK in this regard.
And also one thing to bear in mind is that some hybrids come with front suspension. If she's considering this then maybe she should reconsider. It's heavy, it's another thing to go wrong, and she probably doesn't need it.