If your supplier (i.e. Orange) is connecting the call then they are going to charge for the service regardless of what the usual practice is in FLorida.
I'm not a great expert on this but as I understand it you may connect to the Internet via your supplier, or you may connect via someone's wireless modem. The latter if available, it ought not attract charges. Your daughter ought to check how she is connecting.
£200 sounds a heck of a lot, but has she been surfing too ? And it is international rates.