She didn't. Most monsters didn't care how much was in your bank account, they were ready to eat you up all the same. Emily just thought it was in both of their best interests if she tried to steer them straight.
“Well, now that you've pointed out that pewter is pretty fragile, I would pick something sturdier, yes,” she mused, chewing her lower lip and glancing over at the storeroom. “I've done wood, glass... white-gold. Expensive things.” Tucking her dark hair behind one ear, she cut a glance back to Markus and smirked as she said that, referencing his 'it's expensive, but still cheap' attitude. She found it amusing enough to rag on him about it. “Also... That's something your sister got for you. I wouldn't enchant a sentimental item unless I knew the spell back to front.” Emily had enchanted her grandmother's hair comb, but that was only after weeks of research and testing.