That's really good advice. I got similar advice from someone else. Because of it, we had her run slower to start and accelerate instead of starting at a sprint and staying there. She scored 9.775 at her state meet, so I think the advice helped.
You say "we had her....". Are you coaching your dd? If you are, as a parent/coach myself I would recommend that if you are not her "official" coach, you really should not be giving her technique advice. Stick to general encouragement. A parent is the cheerleader, banker and chauffeur for their child.