@831817toe
https://en.m.wikipedia.org/wiki/Gambling_in_Japan
tl;dr if she wanted to do some gambling involving dice she'd probably have to do it at a casino run by the Yakuza which probably wouldn't be a casino she'd want to win at too many times. We'd learn what happens to demons who die outside of Hell though.
Wonder how long it'd take for Casinos or gangsters to fuck your life up once they found out about that little gift. If she's not smart enough to realize the implications of that power, there's no way she's smart enough to take some losses or switch up casinos.