If what she is stating is not true and you have suffered damages, then you are within your right to sue. for damages and possibily an injuction. However, since its family, I am not sure a suit would be the best thing for you. Good luck to you.
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Slander is defamation by the spoken word. The "publishing" of a false statement to third party/ies, which a radio show would qualiffy, causing damage to the subject's reputation, and economic damages, is actionable. In the most technical of legal senses, abortion is legal so you are not being accused of a crime. Of course, from a religious point, it is a moral crime and may cause you a loss of reputation, etc. in your community. If you think your situatlon fits within the above parameters then consult an attorney in your area. However, to be frank, most attorneys will not want to spend time pursuing a claim, even a valid one, as a matter of "principal". And defamation cases are very expensive to prosecute. So reflect hard on this matter - as you say, your family and most likely friends know the truth. As an aside, with the rarest of circumstances, and unless your daughter was born with physical defects, it is almost an oxymoron to say that "I am a survivor of abortion". Most intelligent people will likely give your daughter's claims the short consideration it deserves. Good luck.