She has a lot of trouble with the "what is the main idea of this passage" questions. I suspect it's because she reads it and her mind goes wandering off about every sentence, and by the time she gets to that question, there are lots of other things in her head that weren't actually in the passage, and then (as Zen said) she writes down some little piece of what's going through her brain.
So again, I'll suggest going over a couple of these passages with her (using passages she's never read before). I would ask her to read a passage and answer the first question. Then I'd talk to her about the answer to try to figure out what she was thinking when she wrote it. Etc., one question at a time.
