I don't think she was starving, but typically when someone is out of juice, they're exhausted and not capable of fighting/playing/continuing. Which strikes me as odd given her presumed power level as White Queen.
I am not sure Lara is as personally/magically powerful as her political position suggests. To some extent that's true of the White Court overall, but more so in Lara's case. She hit Lord Raith when he was greatly weakened -- and a few years later, WN wiped out much of the leadership of the other White Court Houses.
I don't think Lara was the strongest WCV supernaturally, at least before WN -- and even now, Thomas (when uninjured and feeding) might be at least as strong.
On the other hand, even the "backwash" of Lara's full-power emotion-blast at the end of BR is pretty overwhelming. But Harry's never been hit by an equivalent blast from Thomas or a top-end Skavis or Malvora (except Vitto -- who was stronger, but Outsider-boosted so not comparable), so we can't compare.
EDIT: forgot about Vitto's attack