Consider this: Since you need CC'd silver units to awaken units, you could place Betty to solo the goblins and wolves that spawn during those waves while farming Silver Fairies.
Dragon Hunting can have Betty hold the front really easily, supported by an archer/witch in a corner to handle Dragons and deal with anything that filters pass Betty
It'll be a while, but pretty much whenever you're farming, find if you can throw Betty in an area where lots of little guys are passing through.
Having not played DMM, I can't answer if it's worth it or not, but it might add up. I should hope.