The phone will work, but she has to get a prepayed dutch vodafone sim card.
The sim card is 9,95Euros I think. You have to add the internet "bloX" for additional 9,95Euros.
Then she has mobile internet. With the mobile internet she can use facebook, twitter or any other chat/texting platform.
http://www.vodafone.nl/english/prepaid/blox/
old but the basic information is still up to date:
http://www.telecompaper.com/news/vodafo ... etherlands