If you donate your kidney, she lives. If you don't donate your kidney, she dies. Either way, the government cannot compel you to donate your kidney to save her life. You can say "This is my body, my choice" and the woman dies.
Same with abortion. The woman makes a choice about her body, the baby dies. This isn't the government's business.
> Opponents of abortion simply feel that much abortion is highly questionable ethically and feel that a society's treatment of the weakest and most defenseless among them speaks much about the character of their society.
Then by that logic, they should be arguing for organ donation to be mandatory.
> In modern society women do have complete autonomous control over their bodies in determining whether or not to become pregnant.
Tell that to a woman who gets pregnant from being raped.