Then Val, she would never pass her quizzes at church...
(Thanks ColinsMum)
Wren, my feeling is that it's okay if she doesn't pass her quizzes. If religious education is in part a journey of discovering the philosophies that work best for a person (and also an area where the right answer is based on the individual), then "failing" a quiz created by people with one set of ideas out of many is really
not failing in the traditional sense. It just means that she has different ideas. The nuns might not like it, but that's too bad for them.
What's important is that your daughter knows that if she asks questions that may not be easy to answer, she won't get yelled at or made to feel bad (I certainly don't get the impression from you that you would make her feel bad for asking tough questions!). This may be the most important part of an honest religious education.