Everything is done by computer. A central programme for all councils around the country.
The individual schools have no idea of your preferences and your CAF choices are in no way jeopardised by your order of preferences.
As KCG says, it would be very unlikely that all those girls above your DD will choose SGGS. (My DD is one of those above your DD and she is hopefully going to KEFW, but our second choice is AGS, so one less for you to worry about already!)
If SGGS is your first choice then you must put this as first choice without a shadow of a doubt. I would say you have a very good chance of gaining the place on offers day.
Their lowest offer from waiting list for 2015 entry was 212. Your DD was 17 points above this. I don't think you have anything at all to worry about.
Thank you, nervous mom. Good luck to your DD.