Get her to join (FREE or paid)
http://www.net-model.com
The only thing I will say is in the UK a lot of photographers will not take pictures of under 18's as the law is very strict.
Insist on her having her mum as a chaperone and get a model release signed by her mother.
Many photographers offer work initially on a TFP or TFCD basis (taken for portfolio) where the model gives their in exchange for prints or CD. Work may be limited until she reaches 16 but I do one or two under 18 models who have very supportive parents and do quite well. If she goes on this site she will be known by the time she is 18, but make sure a parent or guardian is prepared to accompany her at all her shoots.
From your message you cannot beat natural light use a reflector to fill in shadows.