Girls, I gave my daughter one banana and half a pear an hour ago. And …

Girls, I gave my daughter one banana and half a pear an hour ago. And within 15 minutes she vomited. Something bothered her before that, I didn't understand and gave her breast milk. Turns out she was nauseous. Then with milk and pear and banana came up? What does it mean now? Shouldn't we have mixed everything? Or is there an infection? But after vomiting she immediately started playing. And a little bit of mucus came out of her nose. Is this normal after vomiting or is it a virus? Or a cold? God, I'm trembling over her. ?