What guard#/length would be used for this style/cut?

ok i would ask her to start with a #3 on the sides n back now i believe its a #2 but have her try a 3 1st in case u like it a Tad bit longer then no # on top ask her to scissor cut it and and go to about 3/4 inch u seem wise good job and also this is a fade cut by the way u need to tell her that if u have the photo i believe u do take it with u and that will help i am a designer and good luck