She has a daughter because she have (in these times) a post traumatic stress derived of her ultra grown speed, she can't have a normal life and all the time she need hide herself from anypony the most of time, the fear of others ponies known she are a half pony half timelord and the possibility of evil somepony capture her make an ultra stress life. But one day she broke up and leave her house and family and follow some bad ponies, they influence to bad actions and one day she find out she's pregnant. with regrets she return on her house.
For her lucky her father and mother receive her with love and happiness, some time latter she she givesbirth to her daughter.
so this is what i get from this series so far so celestia and luna are rivals with seperate repubics? and the ones with golden shoes and a white cape are celestas and umm dunno a bout luna but any way is any of that right???
No no, that is a completely different series. Equestria-Prevails's series is a bit difficult to pinpoint exactly (the most comprehensive story based on it, "Equestria: Total War", while very good, wasn't actually written by him, so we don't really know where it differs from EP's ideas). Basically, in EP's, Equestria goes to war with the Griffon Kingdom (where Gilda is from), where Derpy becomes a general, and at the end, the Mane 6 are somehow lost in some void and Celestia leaves to save them, leaving Luna to tearfully lead Equestria alone in her absence. I believe.