G’day, howyagoin
Regarding your concerns with the station transfer times with your mum, if looking up connections on the sbb.ch website, click on settings, scroll down a bit and set “longer interchange time” to twice. Then have another go and check the differences with the connections.
Also, by clicking on the “transfer” section in the connection details page, a map will be displayed which will give you some rough idea about the platform situation. Including the locations of ramps, escalators and elevators (where available) if zooming in to the max. magnification.