That's the rule of the democratic game. Livni did not accept a coalition with Netanyahu and she hasn't any right to complain. She certainly cannot tell Netanyahu to suicide in order to please her. And she did not even realise that Netanyahu had indeed accepted the US proposal. Difficult to do worse, as a politician.
U.S. Supreme Court denies Kentucky clerk request on gay marriage licenses (Reuters)
from the article: Livni: Israel should have accepted U.S. deal for settlement freeze