Attachment by bank over loan amount n can we able to buy any vehicles

If a property has been attached by a bank due to a loan default, the bank typically has the right to sell that particular property only to recover the outstanding loan amount.
Regarding your mother's plan to buy a car, it's important to bear in mind that if the property has already been attached by the bank, it may not directly affect the car purchase and it may not lead to the car attachment in the bank. Generally, the bank's claim is limited to the attached property or assets related to the loan. However, if the loan default issue remains unresolved and the bank obtains a court order for recovery, they might have the authority to attach other assets if they are deemed as part of the borrower's assets that can be used to repay the debt.