Okay, first I'm not dismissing the rules. I read this post. Spending a season or two to invent a spell isn't a dismissal. A superior quality item would take three average craftsmen, or there-abouts. A single suit of armor, admittedly leather scale, takes 1/4th a season. 18 days. A glove couldn't take more than a day or two. Maybe 6 craftsmen days. A twelfth of a craftsman's seasonal output or 1 labor point. On 40 of city and guild puts that at a bit under half of a pound for craftsmen with a minor income. Now leather scale does differ on some level from electrum metal, but really that could go either way. It would take a little saving, but its doable.
Admittedly I don't know how rare Red Corral is, but if need be that could be magicked up. I was assuming it wasn't particularly expensive. Even today, with out vastly higher productivity and thus wages for a worker a piece of carvel coral is maybe a percent of someone's yearly income. 100ish dollars. (See E-bay), so I'm guessing about a labor point for three craftsmen making one piece.
Ultimately I don't know the prices of labor for the glove/or quill. That's something you need to set. If the materials are the expensive part she would be willing to magick them up. Especially the red coral for its +10 bonus vs demons.
Anyway a scorpion terram-esque familiar would be cool. Alternatively a miniature wolf. Terram preferred. Anyone want to build it?