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If I'm using a wheel on smart trainer and swap bikes on it am I right thinking wheel size won't matter for zwift?
Not on its own, but assuming one is a road bike and the other is an mtb you will probably get different power numbers due to the tyre/roller interface.
It's for my wife to use, she wants to use the folding bike on it as it's got a saddle like a comfy chair, easier to swap bikes on it than swap saddle on my bike for her.
Yup should work fine then, although I find turbo trainers generally need to be faster (higher geared) than normal bikes. So small wheeled bikes may struggle.
As long as the trainer will adjust to fit both wheel sizes you'd be fine in theory. I guess your other option is a comfy saddle on a separate seatpost, then all you have to do is swap seatpost / saddle as a unit - measure the length of exposed seatpost or mark with tape maybe.
I thought Zwift assumed a certain wheel size (700x23?) for some calculations. Not sure what difference it actually makes though.
Can you adjust it to fit?
My old normal Tacx trainer could be swapped between 26" & 700c wheels, but there wasn't enough adjustment to swap between them without taking the frame apart & fitting some spacers to move the resistance mechanism.
I seem to remember that the power calibration is set-up for a 23c tyre as mentioned above. But, this will just mean the numbers are a bit off, I suppose.