In reply to fmck:
Doesn’t sound good. Easier said than done at the moment but your daughter needs a face to face with a GP. Emphasise the longevity of the complaint, emphasise that it’s getting worse. Get the name of the doctor you’re speaking to, ask them to spell it to underline that you’re writing it down. If you aren’t happy with the response you are entitled to a second opinion.
A seal like bark might indicate swelling around the larynx but any diagnosing over the internet with the details provided is essentially worthless. Good luck