I don't think this means pretty girl but 好色的女人 since chhio1哥 means 好色的男人。
The hanzi is dog radical on the left with 肖 on the right.I don't agree with this hanzi because in dict it means crazy.
The is why you see Prof.Chiu own xiamen dict just put 口。It was teochew expert says it has siau sound.Prod.Xuchengchang put 鬼+肖.
宵 in chuanchiu don't have siau sound in chuanchiu
It's "bi le" (someone please help me with the tone numbers!).
In case you are unfamiliar with the spelling convention, the amove pronounced as "bee lay". 美麗 "Bee Lay" (or the reverse, Lay Bee) is quite a common Hokkien name for girls.