With her rough start to life it will probably take her a few weeks to catch up, I would ignore any comments and just focus on a slow steady weight gain for her just like with any puppy. You don't want her to get too fat just for the sake of her tipping the scale by a few pounds, all dogs are slightly different.
Jasmine - Female Miniature Poodle - born Aug 15, 2010
Loker Delgado Von Stalworth - Male GSD - born Jan 26, 2012
Koda & Zazu - 5 year old male cats
Alex - Male Cocker Spaniel (rescue) - RIP Cuddlebug 2007-2010