"She's only a little girl."
This book as a loli/pedo fetish girl in it that's a "Super Soldier" which means that she's bred for warand doesn't know much about relationship or the outside world.
So the ADULT male audience can fantasize about raping her while "teaching her all about the world/love/men" and all that gross shit they fantasize about.
Also her mech is bright purple because LITTLE GIRL. I'm going to guess at some point it will be said how "adult" she is or something.