I find this extraordinary - the first thing I'd write down is why the holiday is cancelled, and ask for it in writing - you don't deal with things like this solely by phone.... is she sure that it WAS Thomas Cook, and not one of her friends cruelly messing about?
Her reaction does seem extreme if it is genuine, it may not be Thos Cook's fault at all if the resort is dangerous or travel is not recommended due to the earthquake.
Thos Cook have a website, they have email address, why does she need to wait until Thursday to visit the travel agent? - they have phones and emails too.
She needs to look also at her travel insurance (I hope she has this in place) as this may cover cancellation by the agent, so she could get (some of) her money back that way.