OK, she's a young girl, a cadet, so she'll be somewhere in the 13 to 15 age range, so stop being a bunch of perverts will you!
As for the "10 stone overweight" bit, it's patently rubbish! Read the CAA stuff, as long as you are healthy and reasonably fit there's no issue with your actual weight.
As for the airlines, most of them only want to know that you have passed the CAA class one medical, which you will have if you have a current licence. Ok so some of the airlines might request slightly higher fitness levels but none of them can use weight as a measure.