In fairness she does look marginally more disorientated than normal
Is the BBC still in / around White City / Shepards Bush?
She was presumably on her way to changing to the Central Line to get there. Perhaps that call she's answering is someone telling her that she's ill, hence the confusion...
It seems it possibly wasn't a very good sicky
(Obviously it's perfectly possible that she was ill at that point but it's not going to go down too well)