Hi There! If your daughter is "very clever, loves learning, musical and sporty" she would fit in perfectly at Tormead. It's a school with a good community spirit, girls are friendly, down to earth and on the whole, kind.
Regarding your DDs particular requirements though, I would suggest calling them up and having a chat. There are girls with all sort of things going on in their lives there, and we've always found the school to be supportive and proactive with us and our issues, plus others in my DDs year. Unless someone else who has a neurodiverse DD is on MN and can help you specifically, you might not get an exact answer, but I'm sure the school can tell you what they can, can't and perhaps already do for others who are similar to your DD.
Have you visited already for an open day? It is a busy school from time to time, like all senior schools, and given that it is in Guildford, although there is a family feel, there's also no escaping the fact that it has a city-centre school edge to it, which may or may not be what you're looking for? If you wanted a quieter environment I would imagine priors field might be a good fit (have you called them?) As it's a much smaller school, not in the city centre.
Ps. What year group is this for, I thought Manor House were becoming Prep only now, so you daughter would be at StTheresas if she went there for year 7?
Good luck! X