Irrational solution: Somehow persuade her to give birth, kill her once she's had the baby.
Rational solution: I know it's hard mate, but she is the one carrying the baby and ultimately she decides what happens. If her mindset is on that then there's really nothing you can say or do.
She might have been your girlfriend for said amount of years but if she's willing to just phone you and announce she's aborting YOUR baby, then it's not worth hurting yourself over. Don't kick yourself over what is ultimately her problem.
She doesn't deserve you, and it's good to cry. Move on Glenny.