Welcome to YT. Oh boy, 3 at one time huh? Well if money is tight, definitely get pet insurance. Its a monthly bill, but way better than if anything happens and you need to come up with $3,000-$5,000 for a necessary life-saving operation, when you least expect it. That makes me so sad to hear where your pups came from and how they just 'gave away' that little girl.
I hope you have enough love in your heart for all 3 of them! Sounds like they need it and have some making up to do in a warm, sweet, safe, loving home! Good Luck to you!!!