I assume you heard about the ex-KGB spy Litvinenko who got poisoned and died late November (if you haven't, catch up here). He is connected to one Boris Berezovsky. Traces of Polonium radiation was found at 7 Down Street, London - Berezovsky's office.
Cristina's company were at said office for a few days early November to do maintenance of home-automation systems. She and her colleagues had to be tested and at the time of writing we're still awaiting the results. To get poisoned you literally have to swallow a fair amount of this stuff, so there's nothing to worry about.
Galician and Spanish media has been doing interviews ever since and Cristina's face popped up all over the past 2 days. This post is just a collection of media for posterity.
Screenshots of the websites: