Your Clara is my great-great-grandmother, daughter of Jules (Julius) Prosper Kalanquin born in Frahier, Haute-Saone France and Mary Kalanquin born in Ohio. Jules and Mary were 1st cousins (their fathers were brothers). I would imagine that your Mary Selena Kalanquin must have been related somehow, but I don't think they were siblings. Jules was born on Sept 29, 1843. Cousins perhaps? Do you happen to know what town she was from. If so maybe try looking at http://www.servancnaute.fr/
It has excellent birth records although it could be challenging if you don't read French. I would search for her in Frahier and possibly the surrounding villages in the Haute-Soane region of France. I've just recently started digging in on this line myself. They seem fascinating!