Johny has a pet shop, Animal shelter, which sells pets and pet care products. Animal shelter also provides lodging for pets when the owner is away. Emily is a regular customer of Animal shelter as she usually sends her cat, Fredo, for grooming and lodging. Recently, Emily sent Fredo for lodging in Animal shelter as she had to work in Indonesia for a week. While in Johny's care, Fredo became ill and vomited a lot. Johny tried to call Emily a few times as he was uncertain whether to take Fredo to the vet, but he could not get through. Worried that Fredo's health will get worse, Johny took Fredo to the vet. He had to pay RM450 for the vet's bill and give medicine to Fredo for the next 5 days. When Emily returned, she was upset when she saw that the bill from Animal shelter was more expensive than usual as it included the vet's bill and additional costs for looking after her ill cat. Emily refused to pay as she did not authorize Johny to take Fredo to the vet. Johny claims that he had to do so as it was an emergency. Emily wants to know if she is liable to pay.

Advise Emily on the above situation by applying the Contracts Act 1950 and relevant cases.