,What network is she on and what does the symbol at the top right show, it should be something like edge, 3G or with a blackberry symbol, please note it down exactly.
Edit - the reason I ask is that Vodafone have been having Blackberry problems recently (or at least last week, had trouble getting a BB to activate) and the status symbol at the top right indicates whether the Blackberry has successfully connected to BB services. A lower case symbol (gprs, edge, 3g) means it has reception but hasn't been able to sign onto the data services while an upper case symbol (GPRS, EDGE, 3G# (Blackberry symbol)) means it has. I'd try switching off and pulling the battery out, if it powers back up with the lower case status symbol you need to give Vodafone a shout to check if there's something wrong with the BIS (Blackberry services) on the account.
John