Believe it or not, her microwave is likely SIGNIFICANTLY easier to fix.
In the microwave circuit ( non inverter style) There are very few components..
Leaving out the control circuits, ( switches, timers, relays etc..)
The components are basically:
A step up coil, a capacitor, a rectifying diode, and a magnetron.
There is a chance of residual high voltages, but most microwave capacitors today have been built with internal resistors/resistance to bleed power off to make the device safer for dum dums like me that love tearing things apart.
I have fixed a LOT of microwaves over the years.
Ironically I started this by scrapping a lot to get the ceramic magnets in the magnetrons for a wind gen.
click on thumbnail for larger image
I have never yet seen a bad coil. A rough guesstimate, and this is counting only totally non-working unit.
I'm not counting display troubled ones (which are a LOT).
About 60% of he microwaves I have messed with are nothing more than a blown fuse, or heat fuse and/or thermostat.
The rest, in order of most common failures: rectifier, capacitor, magnetron, timer.
There was only one where it was any of the switches or relays ( only 1 of near 200 or so).
If anyone is interested, I suppose I can get into the theory of operation, and how the circuit works.
A microwave is amazingly simple, if you don't count digital controls and timers.