Yes, she did only berth on T3. I tracked her on AIS.
Bunkers? possibly. However, although I'm a frequent visitor to Holyhead, I've never understood the refueling operation there. There are large bunker tanks on Salt Island and tankers visit terminal 4 regularly to refill them. However, another tanker (usually Keewhit) visits to bunker Stena Adventurer and Ulysses directly from her hold - or so it seems.