You'd need to do an Assumption of Liability to take over your line. Depending on your credit history, you may have to pay a deposit.
Exactly how do i do that? I am just a teenager in college and not much credit to go on haha
click here, then scroll down to Assumption of Liability:
Basically, you and your Mom either need to visit a Corporate Verizon store or she needs to call Customer Service to begin the process.