As far as I know, this is a foundation school running its own appeals, so the number of parents with direct experience of the system is going to be limited.
However, appeals are basically the same everywhere - they all have to follow the Code published by the DCSF. The only difference is in how strict appeal panels are. The following newspaper article discusses the widely varying success rates for different authorities:
www.guardian.co.uk/education/2008/may/2 ... s.schools1
(I'm afraid you won't find any specific reference to grammar schools, let alone individual foundation schools, but it is possible to find out the percentage of successful appeals in recent years for a foundation school that organises its own appeals - write to the school and request the details under the Freedom of Information Act.)
Assuming that the testing arrangements were properly administered, your only hope is that the appeal panel will sympathetically consider any alternative academic evidence/extenuating circumstances, so I suggest you look at the Q&As, in particular B11 and E11 (which will need adapting):
www.elevenplusexams.co.uk/11plus-appeal ... nswers.php
If your daughter's result has already been officially "reviewed", then you also need to be aware of the following:
www.elevenplusexams.co.uk/forum/11plus/ ... php?t=5499
(see the section in red, and the update of 26th September 2008).