She can most likely take it unless she has a microvagina lol...dunno if they exist.
I thought I wouldn't be able to do doggy but I did. All I had to do is put my right leg to the side, stretched forward, and go slow...
But a girl taking ten inches...that's freaky...I mean where can she put it all...internal organs and all that.
Anyway, she should be able to take it. Just go slow.