Usually not, without special circumstances, and some embassies won’t extend at all. Why not have her fly over before it expires, and then she can return to finish whatever business she needs to do? Probably least fuss although obviously not least cost method.
I am curious as to what embassy, because if it was only today with such short expiry she was presumably on AP for a few months. Embassies often give the option in cases like this to redo the medical, as visa expiry is 6 months from medical. Did they not offer this option, or did she not take the option?