Mom thinks she is capable of using the microwave. Seems OK heating water for coffee, but hits the wrong buttons for baked potato and other things that could burn. Should I unplug our microwave? Then, she may try the stove, which may be a worse hazard.
You might want to try teaching your mom to use time settings on the microwave. The start button on my microwave runs the microwave for 30 seconds with each push. It took a few times, but eventually got her to just use "start" to reheat because "that's so much easier".