Her assumption that the Resistance didn't have a big presence in Aberdeen was likely incorrect. Or, one of her former comrades saw her sitting at the bar of the crowded pub. Possibly her arrival via the Muggle train was noticed by an interested party. Maybe it was the large amount of alcohol she consumed, but she wasn't all that concerned about her capture. Her time on the run was bound to come to an end eventually. Perhaps she could look forward to the ending of her misery in just a short time. Antonin always liked to accuse her of harboring bleak and fatalistic thoughts at every turn. He was an intelligent man for all of his brashness and fury.