Dude, keep your baby! You adopted a dog, and promised her a forever home, and started loving her. You can't take that back. And if you took her back, she'd probably be killed. You already love her, and she already loves you; you can't just take her back to be murdered.
And your Mom is being so horrible, it's very upsetting to me. No one else even had the time to help your last baby when she was at the end. You deserved to be loved, and considered, and YOU were the one that gave her love, and made the hard choices. Your Mom didn't care enough to give your dog the attention she needed, and then the most difficult decision that was necessary.
Is that really someone you want breeding dogs? I don't want her doing that.
You saved your baby from death, and your mother has absolutely no right to request you take your angel back and sentence her to death. She is already yours, and you promised to love her and take care of her; to be her human for forever and always. It would be disgraceful and kill you inside to take her back to die.
Your Mom is just trying to manipulate you, because she likes Golden pups around it sounds like. But if she can't even help you when the family dog is in need, she shouldn't be around puppies, and probably wouldn't help at all. And keep in mind every new pup will take the place of a rescue angel like yours. For every bred pup, there will be one less home for a dog in need, like your new angel.
You've seen what it is to rescue now. You've seen how deserving these beautiful animals are, even though most are killed. Do you want to be responsible for the death of at about six other loving pups, due to breeding when there are already too many pups, and not enough homes?
You can't control what your Mom does, but you can control what you do. You don't want to take your angel back to die, so don't. And if I were you, I wouldn't breed either. There are just too many sweethearts already that would do anything for a happy home. I have one too, and I thank God for her every single day. If your mother is being manipulative and immoral, don't let that effect who YOU are. And if you take your dog back to die because your mother is being ridiculous, will you ever be able to forgive yourself?
Don't you dare let your loving heart be swayed, or turned. Love is too beautiful.
PS- I'd love to see some pics of your rescue baby! I bet she is so happy to have found a loving Momma. My rescue is always so ecstatic and proud of us, her loving parents. It's been years, and she still feels just as delighted and grateful for a Momma and Daddy that love her so much. Yours will be the same.