Congrats on the cutie! I like pale bettas, especially white. Could you see any hint of horizontal stripes when you got it? Sometimes you can catch them even on a youngster if its stressed. I'd guess girl too though. Male veiltails usually have longer fins at an inch. I miss having bettas around, but my last girls didn't do too well with the buenos aires tetras and I don't have room for a seperate tank right now.

Have you though of a name? Pallid would be a cute name, it's another word for pale.