LOL, Wow looks like we may need a vote here
I think the 600 or 1340 cc is all in your own mind.... I started on a 1000, I was 5'8" and 110 lbs... and let me tell you the 1000 bike in the 80's were tanker trucks... compared to the busa today, the busa is like a 600 back then.
The smaller engines just did not cut it for me... something about wristing it fully open from a low rpm and having to wait until it almost hits above mid way before any power starts to build just killed me. With the 1K I could only get 1/4 way and was like OMG! felt like the bike was going to leave me standing in the middle of the street as I watch it take off. LOL I had to hold on for dear life!! I was in love

I had a new respect for that bike I never dropped the bike and always watched what I was stepping on before shifting my weight.
If its your first bike and your learning.... Key word is learning... you start on a big bike your better off, cause anything smaller is not going to surprise you. Your learning curve is smaller... On the other hand if you started on a smaller bike you still have to learn on a bigger bike... this to me is more risky... cause you just cant do your bad habits like on a smaller bike with the big bike... the big bike is going to buck you right off or take you and it somewhere so quickly your in a state of shock and the rest you already know...
Sorry me just babbling on

She should get the bike she really wants the first time... :2cents:
thats what I love about this board everyone is right hehe