I think you should have your mom take you to a local shelter just to meet some of the dogs there to show her how sweet shelter/rescue dogs can be!

Not saying that all shelter dogs are angels, some have room for improvement {cough... cough...Buddy }
Both of mine are rescues and have their "issues" as ALL dogs have! You can buy a dog from a breeder and it may have "issues" that are the same!
My Sierra suffers from separation anxiety, that's easily handled by crating her if she's ever home alone, or in my case... just adopt another Dog to keep her company! Buddy is a shelter dog that many people would not have adopted and would have been put to sleep because he needed a lot of TLC when he was adopted. But they told me this and I knew what I was getting myself into. What I was getting myself into was getting the worlds greatest Body Guard that has a few quirks . But again...the shelter was up front and honest with me, and I knew his issues.
Please inform your mom about the wonderful homeless dogs that are living their lives in shelters and that are just waiting for a loving family to save them. It's the most rewarding thing in the world!

Like the saying goes.... Why buy when shelter dogs die.