She might suffer the same way if she doesn't get dressed.
I think they'll recover OK if it doesn't happen again - suppose you advise her to put fleece over them at night for a while?

Yep, agree. Way too early for them to be outside, even in a cold frame. They can't go out properly till end of May, and certainly, as the weather isn't very warm this year so far, they should be somewhere heated or indoors until beginning of May.

I hope she had a coat or something over her nightie...

The mind boggles .....With the strength of the wind thatwouldn't do muchfor young plants.....or nighties ?