I don't see how the photo of some kid with a jacked up face justify not putting a front brake on the bike? Just because someone out there grabbed a handful of front brake and got thrown over the bars does not seem like a sound justification for removing the brake that accounts for the most amount of braking action. Sure one brake will do but two is quite obviously better.
However as you stated you are free to do what you want and think is best. You seem to have some justifiable reasons for not installing a front brake. I think those of us here just don't seem to understand what those reasons are based on your responses thus far. You are under no obligation to justify yourself here of course.
All that aside, beautiful build. Hope she rides it a enjoys.