Well, they both go through the crystal columns which show you your past ancestors. Also, spoiler from one of the last few books regarding Aviendha's testing:
There's also the rings that only wannabe apprentices go through which show you possible futures. I think that one might be more useful...
Oh. Well if she hadn't already been raised, they probably would have failed her. It would suck to lose the great potential she possessed, but she failed the test. Although, she probably wouldn't be taking the test before she was ready if the circumstances hadn't forced her into it in the first...
On the one hand, she failed the test. In no way did she remain calm and composed, which is a major component. On the other hand, the Amyrlin had already raised her Aes Sedai, so the test was more of a formality. I don't think they really had any choice!