If we want to kill catgirls, they probably don't have them in Gensoukyo, given they hadn't been invented before the border went up. But even if they did have them, this is still probably supposed to be the first time she's seen one.
Also, paper money only has a live span of about 5-10 years when in circulation. So even if outside money made its way in it wouldn't last long.
She came to the shrine for her first shrine visit of the year.Right now, it's all-you-can- donate time!Gruel※Apparently, can't imagine anything greater than this.Go on, now!¥1000¥50¥500Rice ballBread rollThese coins are what money is! Don't you know?¥10,000Donations¥5 (the standard)¥100Hey!Welcome!¥10I-I'm sorry.Don't put paper scraps into the donations box!