Quick call to ATT while I Viber'ed Barb, from my cellphone, and we found that her international roaming was turned off.   

Turned international roaming "on" and she can now text using data.

The part I missed from her was that she could not text anybody off of WiFi.

I was trying to give her walking instructions from the US.

Needless to say, this was not going to well with a response "I am across the street from the gym ..." and me telling her that she has to go south, just was not working!

Without a cross street, this was useless.

She went back into the train station and received explicit directions from an Eurostar employee.

Then she made it to Jenna's dorm without incidence.

- D, 2:15 (London Time) -> More pics to follow