I can't not be rude about this...
You/your parents/whoever you think is ultimately responsible here (from your post and how old I assume you are, then it's your parents' fault) watched your dog die. Not only that, but she suffered for weeks and died in an extremely horrible way. If it was CHF then it's drowning, drowning in your own blood.
What the Hell kind of people do that to their animal? And beyond that, go out and get a dog again immediately after. You can't afford a single vet visit, but you have multiple young dogs (are they even spayed/neutered? Vaccinated? Do you feed them a brand of food that isn't s**t?). People like the people in this situation cause me to consistently have no faith in people to have pets...
They are lives, in YOUR hands! And they suffer because of it.
And you think your parents should go buy you a new puppy? A white fluffy thing like you described is easily 700+ in a pet store.... (granted, you should be going to a shelter), you think they can afford that when they can't even afford a single vet visit for their dying dog??
Also, in the future.... there's something called CareCredit, it's a medical credit card that can be used for veterinary expenses, Google it.
For that matter... most places (even the hospital I work at) will euthanize a pet even if the owners have no money, and then we bill them.
This situation disgusts me, your pets deserve better.
Educate yourself:
CHF in Dogs
Why Spay/Neuter
CareCredit