In the excerpt from a novel, a character named Elise stands on a busy street corner, watching the world pass by. She feels both invisible and hyper-aware of every detail: the rushing people, the honking cars, the scent of street food wafting through the air. As she contemplates her place in this bustling environment, she remembers a time when her life was filled with laughter and love, contrasting her current feelings of loneliness. The moment brings a mix of nostalgia and sadness, prompting her to question her decisions that led her to this point.

Based on this description, what can be inferred about Elise's emotional state?