A: It's always upsetting to hear these kinds of things from a child, especially a young one. Extremely verbal little girls are particularly known for this kind of commentary. Don't panic yet -- children this age often try these types of statements "on for size" to see how others respond; they're practicing their verbal and social skills. They don't have the maturity to fully understand what they're saying yet.
It's important to take these comments with a big grain of salt. She's looking for a reaction, and giving it to her will only increase the chances she'll keep it up. Next time, look at it as an opportunity to help her say what you think she really means instead. When she says, "This looks stupid. No one will like me," tell her it sounds like she's worried about making (or keeping) friends. Ask about her friendsn and what she's heard other children say about clothes. Help her think through the complicated ins-and-outs of her preschool social life and role-play challenging situations she encounters. When she says, "You don't love me," try responding: "It sounds like you're mad at me because I'm not turning on a movie. I can understand you're mad." Don't address the surface statement -- which she doesn't fully understand, anyway -- instead, address the real feelings underneath. That way, you'll help your verbal little girl communicate her feelings more clearly as she grows.