Natalie is a student at Slippery Stone University. In need of funds to pay for tuition and books, she asks West Bank for a short-term loan. The bank agrees to make a loan if Natalie will have someone who is financially responsible guarantee the loan payments. Sheila, a well-known businessperson and a friend of Natalie’s family, calls the bank and agrees to pay the loan if Natalie cannot. Because of Sheila’s reputation, the loan is made. Natalie is making the payments, but because of illness she is unable to work for one month. She requests that West Bank extend the loan for three months. West Bank agrees, raising the interest rate for the extended period. Sheila is not notified of the extension (and thus does not consent to it). One month later, Natalie drops out of school. All attempts to collect from Natalie fail. West Bank wants to hold Sheila liable. Discuss the validity of West Bank’s claim against Sheila.