2 options mentioned I like:
The Sammy ATIV Neo would be a fine option if price is an issue. It is purely a mid-range offering and will not have all the advantages of the Nokia's, but if she just wants a simple device with a good screen that is large (4.8") but not mammoth (6.0" on the L1520) for easy to see text and commands, it might be a good option.
Also love the L925, so long as the looks are okay for her.
The L1520 is future proof, amazing, and fun. Pure awesome. If she carries a purse, the size will only be a factor if it is too big for her to manage in typing. Carrying and working the screen functions will be easier then most people think as it is a fairly thin device that is designed to be easy to hold. The battery life is a huge bonus.
The iPhone is a great product. No argument. It is easy to set up and use. I find it way to pricey for it's capabilities and would get bored of it. Also, I find it way to fragile for me. But Apple supports it's products, it is easy to find accesories, and if she is still using the phone you pictured, bells and whistles abviously mean very little to her. The screen, small to us at 4", would be a huge jump for her. It is not a bad choice.
Hope you update us on what she gets and how she likes it, even if it is the iPhone.