I'm sure there are lots of two-footed female dinosaurs in the great valley, but she said MRS Twoped, indicating that whoever MRS Twoped is, she is married (or has a mate...) Now, I know there is some debate on this matter, but it appears that Ducky's mother does not have a mate at this time... she did once, in the 1st film I am sure... so her lack of being a MRS would disqualify her...