User blog comment:Tristan Tsunami/Theory on the Dragon Slayers 2/@comment-103.9.199.172-20130416163517/@comment-7418318-20130416171830

Maybe she doesn't get it "yet". Gajeel used to be fine with vehicles too, but at the start of the GMG that effect had just set in.

On top of Wendy being the youngest known Dragon Slayer, she's also using her power less often than the others.