Rollerblade Bladerunner Allure Girls Figure Skates, Ice Skates, Youth, Junior White, Size 1

I am looking for a women’s size 7, what size would that be in these?

Are the blades removable?

My daughter wears a size youth 4 (she is 10 years old). Will size Junior 4 work for her? I am very confused over the term, "junior" on here.

Is it us size or uk size? i don't see size 4 (us woman)