She hates hospitals. Her veins are very weak from her time in NICU, when she had to have a cannula earlier this year it took half an hour to get it in. She is old enough now, not to fully understand, but to have some sort of comprehension. I have some numbing cream to put on her and I know she'll ask "what's that Mummy?" How is best to handle this? Should I tell her to prepare her and reassure her that I'll be there? Or will it make it worse if I tell her?