Pretty.

She is beautiful.

She looks gorgeous out of character
But I think she's pretty as Nancy too

In real life she is more a girly girl and is very feminine, like she was when at the BSA's.

The character Nancy is very much a tomboy. Looks really pretty in the role she plays too.

Nice that there's such an obvious difference - Maddy looks equally pretty in real life too, as she does in the role of Nancy, IMO.