"She's a Betty"?

In high school a classmate would see an attractive female and say, ‘Oh, Emma!

FWIW there was a bit on CBS Sunday Morning this week about the Betty Club in Nebraska (NYT article from 1998) and they mentioned the above definition in the story.

In my high school (the late 90s) people called a hot girl a “bitty/bittie”, not sure if this is derived from Betty but Urban Dictionary sure has a lot to say on the matter…