You ask her what she expects from you

You are unsure what Mrs Collins expects from you, therefore you ask her. "So all I have to do is to show up? I don't have any experience looking after children. Is that going to be a problem?".

"Daniel off course I knew that you don't have any experience looking after children and off course that is no problem, otherwise I hadn't offered this option to you. Well showing up alone is off course not enough, you must also fullfill a certain task, that is not really difficult, it is just out off the comfort zones of most students here. That in combination with the fact, that one volunteer just pulled back their agreement today, is the reason why offer you a reward that good. Don't get me wrong if you don't want to do it, I can find another volunteer pretty easily, I just offered it to you first, because you need the reward more than my other students." She replies.