Your great grandmother's sister is your great-great-aunt.
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Your grandmother's sister is your great-aunt.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
1st cousin 2x removed
The English language does not include a relationship called "great mother." It has terms "grandmother" (the mother of your father or of your mother) and great grandmother (the mother of one of your grandparents. The sister of your grandmother is your great aunt. The sister of your great grandmother is your great great aunt.
The daughter of your husband's brother is your niece.