She may have been enjoying the sounds outside, she may be an introvert and was recharging, she may have been thinking her own thoughts and wanted to finish, maybe the coffee had not finished doing it’s work - sometimes silence is not about being angry or feeling distant from someone. She did tell you she didn’t want to talk about anything. Maybe that’s why she got upset?
She may have been enjoying the sounds outside, she may be an introvert and was recharging, she may have been thinking her own thoughts and wanted to finish, maybe the coffee had not finished doing it’s work - sometimes silence is not about being angry or feeling distant from someone. She did tell you she didn’t want to talk about anything. Maybe that’s why she got upset?