No. I asked my mom.
Yes, you should be concerned and have her evaluated by her doctor.
You should write daughter's if you are talking about one daughter, e.g. "it is my daughter's birthday tomorrow".You should write daughters' if you are talking about more than one daughter at the same time, e.g. "this is our daughters' bedroom, which they share".
it depends when she started
If a male is talking: "Afafine o lo'u atali'i (daughter of my son)" or "Tama teine a lo'u afafine (daughter of my daughter)". If a female is talking: "Tama teine a la'u tama teine (daughter of my daughter)" or "Afafine a la'u tama tama (daughter of my son)".
erfectly normal
Darling or dear daughter
If you are talking about the Sims 2 on the computer, that should never happen.
well you have to know if the time is right. you have to ask yourself if she is responsible, is she old enough, does she need one, and who you think she will be talking to. its a decision you and her have to compromise and make.
talking about menstrual period
they should be talking about stuff
This isn't really a question but I'll try. The term daughter cell is used in cell division so I presume you're talking about chromasomes. In mitosis there are the same number as in the parent cell, in meiosis there are only half the number.
Assuming you're talking about the soon of Apollo his mother was either Coronis (daughter of Phlegyas) - or - Arsinoe(daughter of Leucippus).