iamdrumming,
Thanks very much for taking the time to look into this. It seems like just putting the '1' in front is working for texting. It also seems that if you use 'chikkatalk.com' to send a text via the web, it is cheaper for the receiving phone. I suspect that is because the text gets sent from within the Philippines.
BTW, in case anyone in future ends up here reading this, it may be worth noting that if I text the Philippines from my Speakout phone I just need to enter the phone number in the syntax '639214xxxxxx', in other words no '011' is required.
PS: I actually got a text telling me that they managed to get a flight rebooked for Dec 7, so although it's a week more than expected, she's lucky not to have to be back to work until Dec 10 anyway, and I can probably enjoy another week of peace and quiet!