I agree that the running boards are pretty strangely located as they are only a few inches lower than the doors. What about an amp research "power step"? When she opens the door, the step will automatically fold out and be only about 10" above the ground. They're pricey, but I'm sure you might be able to find a cheaper alternative that does the same thing. Link below.
Quality AMP Research Powerstep & Truck Running Boards | AMP Research
Quality AMP Research Powerstep & Truck Running Boards | AMP Research