Where has she applied to?
And yes, the application being for joint honours may well delay things, assuming that both (or even just one of the two) departments concerned actually scrutinise the whole application rather than just the predicted grades / A level subjects. e.g. all three of ours applied to Warwick (generally on the list of slow responders) around late November, for Biochemistry / Polutics, International Studies and French / History of Art respectively - the first and third had heard by Christmas, the middle one not until not far off the deadline for response to on time applications.
(Obviously could have been other reasons such as Pol/IR and / or MFL just being particularly slow, or way more popular- definitely more than History of Art, but possibly not so much more than Biochemistry? - etc).