This is a community of customers. No one from O2 here.
She may be able to get a bolt on to tie her over.
https://www.o2.co.uk/shop/all-tariffs/bolt-ons?pncfwrd=true
Using free WiFi at a cafe or hotel is she needs to WhatsApp
Ways to contact O2
Guide: How to find help & contact O2
This is not O2 and we are all customers here similar to yourself and cannot answer account type queries.
