Yes, anyone may say this if they know that she is who you say she is. The expression is usually said when there is some similarity between mother and daughter, such as looks, actions, way of speaking, even the same way of dressing. There can be many similarities which would warrant another saying this.
Daughter hates mothers should she send mothers day card to daughter
I discussed the procedure with her and her daughter. Though I prefer: I discussed the procedure with mother and daughter.
Mothers say no because mothers know best.
Mother's grandson as regards her daughter is either her (daughter's) son or her (daughter's) nephew.
No, mothers are not supposed to do their daughter's homework for them. Homework is an opportunity for the daughter to learn and demonstrate her understanding of the material. By doing the homework for her, the mother would be depriving her daughter of this learning experience and potentially hindering her academic growth.
Your mothers daughter
She is your cousin
cousin
Niece. Your mother has children, you and your sister. So your mother's daughter is your sister. When she has a daughter, this is your niece.
It is correct English to say "thank someone for something" eg "My wife and I thank you for your kind invitation to your daughter's wedding"
yes you can!
Because mothers totally trust their daughters to go out with friends.