The .30-06 would be fine for kudu and other plains game. As for the rifle......you are pretty limited since you need a left hand bolt-action. Take her to a gun store and let her try them and see which one she feels most comfortable with. Barrel length - 22 or 24 inches. It won't make any practical difference in the field one way or the other. Select a good 180 grain bullet, ie. Nosler Partition or Accubond, Swift A-frame, Speer Grand Slam, Barnes X, and let her use it for everything.
As for a .416............I prefer the Rigby, but for all practical purposes, if you are content with about 2400 fps with a 400 grain bullet, go with the Remington version. It is way cheaper to shoot than a Rigby. If you decide on a Rigby, you might consider a CZ550 magnum............very good bang for the buck! Regardless of what you get it will have a 24 inch barrel or there abouts.
You can use it for plains game with a good soft-point. You might consider handloading some 300 grain X bullets or other such offering for a bit more velocity over the standard 400 grain loads.
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