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Explanation: You can use "for one" to emphasize that a particular person is definetely behaving or reacting in a particular way, whatever other people do or say. EG. But I for one feel very grateful and very satisfied...
Patrick for one is worried
English Language Dictionary
Certo, può anche darsi che nel contesto vada meglio "e Meg, dal canto suo, era nervosa", però "decisamente", a istinto, potrebbe essere più calzante.