I am sorry you lost Bella, you sure gave her a loving and happy home, that much shines through your post.
The most unselfish and loving act is to turn a loved pet over to someone with more financial resources to explore other care. Not many people are capable of that type act of love. I commend and admire you for trying to find her a home with more financial resources, although I doubt any would have been able to love her as much as you. I think it ended as it had to, I'm sure if she could have had a say in the matter, she would have stayed with you for less days than going somewhere else.