In New Zealand where I live, you aren't legally allowed to use a phone while driving now, unless you use a handsfree set. So its just as well she doesn't live here. Lolol.
But it's still perfectly legal to eat a pie and drive. Lol. That's much harder than texting.
Also, only dipstuffs can't focus while texting. My mother is a classic example, she goes in to a kind of dream state where she is isolated from the rest of the world until she finishes texting.
All the people I know who are good drivers can text, while driving 140km/h, while it's foggy and raining at 2am in the morning.