1) Are we supposed to believe that the only way for that demon-hybrid baby to find love is to be raised by his human father . . . and not his demon mother? Is this another purile example of the show's human=good (or love); and demon=evil (or no love)? If so . . . screw it! It's a Season 6 episode and just another example of the series' inability to rise above it's one-note morality.
I suppose so. I couldn't believe it myself. What makes them think that the demon baby will be good? Mandicore babies are born from unions of human fathers and demon mothers. Maybe, with some magic intervention, the baby might be good but its still hard to tell until it grows up.
2. She was in her ditzy phase. Maybe she thought that she can use Darryl as her personal test subject.