Mrs. Hale describes her as a "sweet and pretty, but kind of timid and-fluttery."
Explanation:
Minnie Foster was likened by Mrs. Hale to a bird because she was a sweet and pretty woman. She also had a reserved nature as can be seen in timid and fluttery nature. The later attributes must have been worsened by her husband.
Mr. John Wright who was described as a hard man must have worsened her condition because it would not have been easy living with him. Having no children must have also made her loneliness worse.
