Vaduz is the capital of the principality of Liechtenstein and the seat of the national parliament. The town, located along the Rhine, has about 5,100 inhabitants, most of whom are Roman Catholic. Wikipedia
Apparently it's 17.3 sq. km in area.
"Most of whom are Roman Catholic" is the key here ...
And here is Vaduz from space. See if you can spot any ... well, anything, much.
I am sure the Prince lives in his castle, it isn't open to the pblic! If you visit Zurich-Oerlikon on a wet Sunday, you can get the idea of exciting things to see in Vaduz. She can buy Lichtenstein stamps in Zurich!
I went to Vaduz a few months ago for the first time. It was so boring and grey that I decided to leave after a mere 2 hours.
Having explored Switzerland, I would warmly recommend Luzern. It's not too far away (closer than Basel/St. Gallen) and it's beautiful. There are plenty of museums and shops as well in case it starts to rain heavily.
if she wants to go this afternoon evening, I have a tageskarte (day pass) valid for today that I got for my family and they are not using on account of the weather. PM me or text me (sending u a PM with my number) and I can see if there is a way to get it to you.
for zurich: kunsthaus art gallery. zoo is doable in this weather and lots of fun, the masoahla hall is worth the price of entry alone and thats all indoors.
IIRC, in Vaduz the tourist office will charge you for the privilege of stamping your passport. I think it was 3CHF. For some reason, people think it is special. I got one and I don't remember why!