Perhaps, though I am not sure I fully agree?
I will admit the butt waggle when sprinting is a tiny bit distracting but I don't really get how the character is overly sexualized outside of maybe the butt waggling with the sprint. Even then it comes off more cutesy to me than sexual in nature.
I know you say your suggestion is "valid" but you never really point out what exactly you see so "sexual" about the character. Perhaps adding a bit of specificity to what you find overly sexual?
Honestly, I really love the character's design personally and aside from that small bit of animation (Which, in my opinion isn't an issue) I am just not seeing it as sexual.
Had to take another look, but I agree with you on this. The run wiggle seems more cute than sexy, although I will say she does come off bottom heavy. I feel that would be better fixed by simply adding mid-section armor for balance. Maybe more detail on the leg joints, since it looks like she's running around in bulky thigh boots.