We had Ds2 tested last Jan and he was on the very young side so it may be a bit different since your Dd is older, but IME we filled out extensive questionnaires as parents, there is another set for teachers, and then we had a first appointment/interview and then after that a testing day. I felt they were very thorough, as we also dealt with lapses that didn't appear daily. You can note the variability in abilities on the paper reports and mention them in the interview, too.
Ds1 (2006). Ds2 (2010). Ds3 (2012).