kickassangel "she is also using internet via iphone (when she can use it, not always possible where she is) to be as in touch as possible." If she's not getting paid, I'd send her a quick text to get her to check with her mobile network what she is being charged.
If she was in the UK, rates might be as "high" as 2.5p or 3p per MB (that's 25 to 30 quid per GB) or "included" in her monthly contract. On my Three mobile contract I get 1 GB for 50p, but it goes up to 100 pounds if I ever went over the monthly allowance, based on 10p per MB. Charges are definitely eye-watering on some tariffs, and often difficult to spot to boot!
However, if abroad, you can be charged as much as 2 QUID per MB. I saw some "sample costs" the other day on a network website and they hinted that downloading a single music track could cost 12 QUID.
She should do as little online as possible... as she is not being paid, coming home to a 2,000 quid mobile bill would not be fun.
Some student had a bill for 8,000 pounds after going into an Orange shop and explaining s/he would be in France, and being told that it would be OK. Absolute rip-off.
EU controls only work at present on the cost of voice calls, and some MEP is pushing for limits on prices for data.
If your head is outside the UK, the costs would probably be higher and without EU laws to restrict fees.