going through this myself now. the answer is yes, leave her to cry it out. the problem is that the you dont have support at home it may never change. I havent had a crier in many years so i posted here a few times for support and to reassure myself that letting them cry is in their best interest. they need to learn to self soothe. good luck with this one and here's hoping that she settles with your consistency even if she doesnt get at home. just a thought, perhaps if you tell parents that their spot is at risk if they dont work with you, it might just make them do their part.