I think Donna should branch out and learn to craft other things.
Probably- she would like to be able to create enchanted weapons more effectively and of course has to maintain her business, but she will probably come to a realization that she will need to broaden her range of craft skills in order to develop her mystery cult to allow others to initiate the touched by magic virtue...
I was also thinking a few related crafts would help her make even finer armaments. Inscriptions, Leather working, scabbard making (whatever skill that is).
As for this mystery cullt thing, could you shed some light on what that is all about?
Basically Donna saw Fleur making a mystery cult and found out that it could be used to pass on the ability to craft enchantments to her apprentices. given her low presence it is doubtful she will ever make it work but it provides a motive for her to do more than sit around crafting swords waiting for the phoenix to call on her to fulfill her obligations.