I am so sorry that your mom is doing that to MuShu. This type of treatment may have adverse effects on the puppy. Her is a link to Purina's website for puppies.
New Puppy Care: Taking Care of Your Puppy | Purina.com
Here is info from Purina.
What are some key tips for housebreaking a puppy? http://www.purina.com/i/all/hdr_icn_audio.gif
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What are some key tips for housebreaking a puppy? Listen
The secret to housebreaking a puppy is to catch him in the act of doing things right and then praise him extravagantly. Pups generally want to please.
To start, take your pup out often - first thing in the morning, after he eats a meal, after a play session, and every couple hours otherwise. Soon a routine will emerge. Be patient. Young pups don’t have the muscle control to hold things in, so it’s up to you to figure out the timing.
To keep stress levels low, contain the pup in an easy cleanup zone until he begins to get the idea. Don’t reprimand him unless you catch him in the act of doing something wrong, and even then, make it nothing more than a firm "no.” In six to eight weeks, your pup will learn what you want, and be happy to oblige.
– Dr. Larry McDaniel, DVM for the “Purina® Animal Instincts” Podcast Series Please try to get your mom to understand that she is using the old way of house breaking. Showing the puppy love and understanding will go a long way in helping the puppy mature and is the best way to teach the puppy.