She might not find the joke in bad taste. I am not sure what youmean by third-party sources, though. She has a sister with a wildly different opinion on the matter ('ah well, it's not like anybody's free from deleterious alleles, so my kid might obtain worse from my husband, but we still are going to have one') and she knows marriage != procreation for many men, but... She's still 'morally obliged' to stay with her parents until the end.