I wouldn't buy a dob for a girl. Especially not a big one, as they weigh upwards of 30kgs. Not very portable for her. They are big and heavy and everything has to be done manually. I would suggest a Celestron 6 SE. They are $1500 from Andrew's Communications. They weigh about 12kg, they have a go-to facility. Here's the link to the Celestron website.
http://www.celestron.com/astronomy/c...xstar-6se.html