Maggie is very cute. Your rough first night brings back fond memories of when we first got Loki when he was 7.5 weeks old ...he's 5.5 months now & our big adorable well-mannered baby, but little fur babies with their sharp little teeth, can be challenging ....& those shortened sleeps a killer lol. Well worth the effort though, as you will already know. Re her low weight ...did she come from a large litter? Our boy Loki was from a litter of just five & the puppies were all a good size. Loki was 5.5 kilos at six weeks ...I think that would be around 12lb. He was heavier by the time we got him two weeks later. Have your vet check her out. Did the breeder worm her at her first vaccination? Enjoy her! She's precious.