Helen Dixon took over late last year as Ireland's data protection commissioner, becoming the lead regulator on privacy issues for Facebook, Apple and Yahoo!  because they have declared Ireland as their main base in Europe.
Data protection rules have become a major issue for businesses and consumers concerned about the information Internet firms disclose to advertisers and security services.
As a result the EU has agreed to introduce fines of up to 5 percent of a firm's global revenue for breaches of its proposed new unified data privacy law, which at current annual revenue levels could mean maximum potential fines of just over $100 million for LinkedIn and as much as $15 billion for Apple.
The role of lead regulators like Dixon as the sole arbiter under the new General Data Protection Regulation would be changed by a proposal that data protection authorities in other EU countries can intervene in cases where they claim to have an interest, potentially giving them a veto.
A counter-proposal to demand that any intervention is deemed "relevant and reasoned" would make the system less unwieldy, Dixon said.
And whatever the outcome, Dixon said she still expects to be left responsible for levying the new super fines for companies who declare their main European base to be in Ireland.
Currently she can only levy fines of up to 250,000 euros, under Ireland's own data protection laws.
"Would the lead authority propose the measure and, where it  is an infringement, would they impose the level of fine? That is what it is likely to be," she said.