Gotcha, seems a strange combo though, St Hilarys is in no way academic really, but smaller and thus more nurturing. Its always been a cosy safe space for kids that do well in smaller environments. Head also good, but leaving I guess now? And who knows with the merger.
GHS is very academic, and doesn't have a reputation (although I'm sure it's fine in reality) for being in any way nurturing, small and adaptable to ones shortfalls, and pastoral care was never the first thing that popped into one's mind locally when GHS is mentioned. If you want good results though and your DD can keep up it's a great choice for that.
StCats is relatively academic too, nice campus in the country, however no more academic than Tormead now, who is pretty much consistently level with it on the results front. New head cooling so could be a breath of fresh air. Never heard amazing things about their pastoral care from family friends there, and some threads on MN, but again I'm sure it's fine in reality for most.
I guess it really looks like you need to think about what you want, each of the schools you're interested in is either academic, or more pastoral, or more nurturing, etc. With inner city or country to choose from too.... Ironically the only school with a good reputation locally for both pretry decent results and its pastoral care/nurturing, out of those you listed, is in fact Tormead.
Good luck and happy hunting.