Women with mental health issues after an abortion probably have a conscience.
ALL people have a conscience that reminds us of our behavioral choices.
Romans 2:14-15 (New King James Version)
14 for when Gentiles, who do not have the law, by nature do the things in the law, these, although not having the law, are a law to themselves, 15 who show the work of the law written in their hearts, their conscience also bearing witness, and between themselves their thoughts accusing or else excusing them)
Now, women who have an abortion know full well what they did, and they choose one of two paths: guilt (and maybe repentance), or justification.