Characterization of Eliza in a Modern Novel Excerpt

Read the following passage, which is an excerpt from a modern novel. Answer the question that follows:

"As Eliza stepped into the crowded café, a wave of noise hit her, but it was the silence in her mind that troubled her most. People around her laughed and chatted, their joyful expressions a stark contrast to the weight heavy on her heart. She forced a smile when Tom waved at her from a corner table, but inside, she felt like a ghost lingering in a world she no longer inhabited. The past week had been a blur of complications, each day dissolving into the next, and here she was, smiling in the midst of it all. 'How could I pretend to be happy?' she mused, her gaze drifting over to the window, where the rain began to fall, blurring the outside world into a watercolor of memories and regret."