Looks a pretty deep burn with a thick and very dry scab and will take time to epithelialise (seal up) underneath – next time she needs to keep it moist with granuflex or something like that to heal faster and reduce chances of scarring (did she see a doc/minor injuries when it happened? She probably should have)
If it’s really red or painful or swollen around the scab (or especially if it’s discharging at all) then see doc as that would suggest infection. If not I’m guessing they’d prob tell her to wait it out as, short of lifting the scab and starting again, there’s unlikely to be much they really can do
Maybe depends slightly what “a few weeks” means though, but also on whether it has shrunk as much as it looks from your photo in that time. Course, we’ve no idea how big that is either.
Oh, IANAD