ok - so no real chance of wi fi in the area - dongle is almost essential!
Lovely place but it ain't going to all that effort to maintain its historic look for nothing.
If you're visiting down that way, pop into one of the phone shops in Hastings or Ashford and ask which gives the best signal.
Lovely place but phone masts are not 2 penny in that area - got the Gardens of Kent to preserve
If her mobile phone doesn't have any problems then go with that provider because the dongle will piggy back off that mast.
Essentially your dongle is a mobile phone sim plugged into a case that only transmits and receives data. Has its own phone number and connects like a normal phone - just calibrated to transmit and receive data - not process it. Your daughters computer will do that...
Lovely part of the world - if you're really lucky you might find her focused in the view finder of Jonathans Hassalblad - he's only up the road! Drop him a line to see when he's about - you'll get to see Canterbury and his gallery. I'm still waiting to get there - weather has stopped play twice now. But i'm guessing it'll not be a wasted trip