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Get an oven thermometer, one of the all metal and glass ones that can either sit on or hang from the oven rack, to test the correlation between the markings on the knob to the actual oven temperature.
If temp is not the problem, sometimes folks use a pizza stone on the rack or bottom shelf to even out the cooking characteristics of these RV ovens.
What altitude are you at? High altitudes require longer cooking times too.
After these suggestions, I'm pretty much out of advice, except for maybe she should try out the convection/microwave unit, if you have one.
On edit: Do the dollar(or strip of paper) bill check to make sure that the oven door gasket is sealing all the way around.
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