Answer:
Elly has overdraft protection.
Explanation:
An overdraft protection is an option through which prevents the user's account to fall below zero, that is, it doesn't allow to reach negative numbers in the account, it doesn't give a credit to cover an specific payment that can't be covered with the money currently available.
So, Elly's problem is because her overdraft protection, she won't be able to pay for the new hair style, her account just will reject the payment, she need $8 more to do the payment.
