My fiancee carries the following:

* Pink Leatherman Squirt S4 in purse. I convinced her to carry a Squirt P4 first (she was initially against the idea), then I asked her if she'd rather carry a Micra, which she did. She finds the scissors more useful than the pliers. I disagree with that but I'm glad she's carrying something. Someone on bladeforums.com posted about the pink Squirts and I decided to buy her an S4 since it has the same imnplement set as the Micra and pink is her favorite color.

* ARC-AAA P. Before I knew about good flashlights I carried a Maglite Solitaire. She wanted one so I bought one for her as well. Later I bought an ARC-AAA P for myself which is worlds better. She expressed interest so I bought her one.

That covers the two most important and useful items, IMO right there, but she also carries:

* A compass. She asked for one to help her navigate on her driving trips for her job. I gave her a Brunton 12NL, which she liked but lost. Then I gave her a Victorinox compass / spirit level / ruler / thermometer / magnifying glass, which is what she carries now.

* She also has a mirror or two for makeup, which could be handy in an emergency.

I suppose one could do worse.