That's actually not too far-fetched, I've known university students which parents wouldn't let them be alone for a week at home.
I think in cases of single father/mother it's even easier for they to become overprotective.
honestly, maybe a actual baby-sitter would have worked out better since then her chastity wouldn't be in danger, I guess.
Story of my life here. My mom always call my aunt over whenever I get to have the house to myself. I guess the single mother being overprotective is true.