Honestly I can't think of a better way to gain experience speaking in a radio-like environment, if the speaking part is what she is interested in rather than programming and so on.
People are making podcasts about all kinds of random things these days, and some of them sound very like radio. I think it helps if she can find a niche subject that she's passionate about and which nobody else has already made a wildly successful podcast about. (Which is probably even more difficult than thinking of an original name for your Twitter handle or blog.)
But for example, I am interested in walking the Camino de Santiago de Compostela, and there are a number of podcasts where the presenters are just interviewing people who have done it, talking about where the best hostels are and how to prevent blisters. I also love the Cormoran Strikes books by Robert Galbraith (aka JK Rowling) and there's a big podcast hosted by three women in the US where they basically read through all the books together and make 30 minute podcasts discussing each chapter. The books are huge and there's 7 of them and counting, so plenty of material for a podcast there.
The ideal would be if she can find an interesting subject that has plenty of potential for discussion, and a friend who is also interested in doing a podcast, because then you can have two presenters and any number of interviewees.
She could do one about university life and interview other students at her university about their courses, their societies, their experiences in halls, anything really. That might be of interest to prospective students.
One health warning though: she just needs to be careful she doesn't say anything on a podcast which could get her into trouble. It's like any social media really. Don't put anything on there which you wouldn't be happy for a future employer to see.
But it would be a great way of getting experience planning content, interviewing and talking on air.