I wouldn't be handling a WC frog at all, especially fir daily feeding. What she's revering to is a cricket bowl. A glass bowl, big enough for the frog to get in and out of, fill it with crickets and they can't get out. Greanted some may jump out, but rarely. Dig substrate so bowl can sit almost level. Especially at tge begining, your frog may not understand and get stressed. Remove the bowl after frog eats. Check bowl for any chipped edges and etc.

The holder of your frog probably had them in a opaque plastic bin, where they can't see out, and u should cover all sides of your viv for atleast a month. Noise from a house is stressful enough, much less seeing what's making the noise. Your dead frog was probably trying to make a nighttime escape and fell, breaking it's back.