Thanks, @Soma, those are good points. I'll mention theatres, but she also plans to keep volunteering at the museum throughout term-time on afternoons she doesn't have classes (it's down there rather than up here, which I didn't make clear). She's on the 'collections team' helping with accessions and cataloguing, as well as helping with craft events etc.
Her (salaried) boss also went into museum work after a design degree, and I think that's given her the idea. DD will also pick boss' brain about routes in when she's got her feet a little more under the table!
Yet another world I know nothing about. DS (just finished Y12) wants to do a STEM course and that's much more straightforward.