She's quite certain this is a bad idea. But she's also quite sure she has no choice in the matter, however much she doesn't want to be here. But. She chose this. Chose this path, and this method. They had given her a choice of which ritual she would perform, and she had studied it very well. And she understands why exactly they're doing this to her. It's unpleasant, but... it's as the Dark Lord decrees, so. Here she is.
She's the only one not in thick winter robes and masks, but she can't really perform the ritual with all that bulky cloth, so she's dressed the innermost layer of her Hogwarts uniform. She's freezing, her warming charm had worn off a little while ago and she has no time to recast it.
They linger close, watching ever so silently, their stares heavy on all sides. It's oppressive, but she's dealt with worse over the years. And finally, she finishes setting everything up. The moon is full and shining down on her, illuminating her surroundings.
"May I begin?"