How far can she actually walk? I am assuming 100-200 metres, enough to cross a large car park. She would need at least this mobility to navigate a station.
The answer also depends on which part of Switzerland you are going to. Large parts of the Alps are permanent snow cover, plus glaciers, which you can see from the towns and villages in the valleys. Here is my hit list:
1) Travel by the Bernina Route. runs from Chur in Western Switzerland to Tirano in Italy. Views of Glaciers. This is best if incorporated into a tour as your method of getting between Switzerland and Italy, not as an excursion as you would have to come back the same way.
2) If visiting the Jungfrau Area. Virtually anywhere has views of snow-topped mountains. See here: https://jungfrauregion.swiss/en/summer/
You can get the expensive train up to Jungfrau summit, which overlooks Europe's largest glacier. See here: https://www.bern.com/en/detail/jungfraujoch
3) My favourite Titlis. Day trip from Luzern. Series of cable cars to snow covered summit. You can walk on and inside a small galcier. Website: https://titlis.ch/en
4) Zermatt and Matterhorn.
Many, many more. I hope this is enough info.