Those aren't the pieces, but the specific components of the aural test - test A is where they have to clap in time to a passage played, and then say whether it is 2 time or 3 time; test B is the singing back phrases ones; test C is where they have to identify where a change (note/rhythm) occurs in the passage the examiner plays; and test D is where they have to answer questions about loud/soft, smooth/detached, etc., things like whether they were sudden or gradual.
Having a good ear helps, but it's not the only thing you need - had she definitely practised the actual style of tests used, rather than auraltraining in general?
At grade 1, the questions are asked in such a way as to mostly have right/wrong answers for the tests where they have to say something. For the singing echoes test, it has to be the right notes and in time to get perfect marks, and the clapping has to be on the beats in the clapping one, but there's not really a whole lot of room for the examiner to be harsh/easy at this level. How well the student sings isn't a factor, just whether they get basically the right notes/time. From those comments, it sounds like there were actual mistakes - nerves definitely make a big difference for me!! I struggle with aural tests, especially the singing back one, anything to do with memory - and that's worse when under pressure. I can also sometimes hear what I intend to sing, but it comes out as something different, again worse when under pressure. When you are nervous, it's also hard to pay attention properly when the examiner is playing the excerpt, wondering what aspect you'll be tested on and trying frantically to take note of all of it, instead of just relaxing and listening. Nerves can also speed up your heart rate and make you a bit shaky, which then means you tend to clap/sing things faster than you might intend.
There is a topic in the 'Education' forum at the moment about Grade 8 aural, and in it there are books/CDs/websites etc listed that all have the lower grade material as well, so might be worth practising some of those under 'stressful' conditions before the next time, so that you can get a sense of where she is likely to go wrong. I've tried all of those myself, and am hoping to find more examples somewhere..