Yes, I was going to recommend to you the 301 since it uses AA's and has a dead-simple interface.
Two things to keep in mind:
I have my mother-in-law a fenix L1p and she loves it but finds the clicky difficult to operate. Definitely not one handed--she always has to use two. A twisty might be easier depending on her hand strength (current and future).
How comfortable is the light to hold in the hand? A lot of lights nowadays are optimized for EDC pocket carry and are really not that comfortable in the hand. I find my Nuwai Q3 is that way: about 1-2 cm short of covering all my fingers when gripped. I assume that she'll be carrying this while walking and not keeping it in a pocket all day long. Actually a 2AA or 2cr123 light are a pretty good length for grip.
Thanks for all the great suggestions I looked up every one. I ended up going this route as it is pretty simple off-low-high-off --was going to pick of the Amilite T5 but for over 50% cheaper and able to operate on RCR123A's it looks like a winner.
