There is a pretty much complete embargo on stuff until 8am tomorrow (Thursday). My admissions tutor colleagues won't even email us to let us know how we're doing.
Most university home pages (landing pages) will have something about Clearing on them. Mine has an email thing you can sign up to which will notify you if there are vacancies in the course you're looking for.
So rather than ringing, she can spend today seeing if the universities she's looking at have something similar.
Then tomorrow, after 8am, she can re-check the Home pages for directions to Clearing in the universities she's interested in.
I'd be cautious and not duck out of my Confirmed & Insurance offers till I'd done this, but given she doesn't want either course sh chose in May, it may not harm her prospects.
But the usual order of events is to have an informal offer of a place she wants, then withdraw from her confirmed place. It is important to be direct & as prompt as is judicious about withdrawal from your confirmed & insurance offer, as they can then be offered to other applicants. (In theory, Universities can require you to take up a place, but no university will actually do that in practice!).