Aniela authorizes Adnan, her agent, to sell Aniela's antique diamond ring for not less than 3,000 and to purchase twenty plasma screens for Aniela's business for up to 6,000. Adnan buys the ring herself for 3,000 using a nominee and then sells it on to a dealer for 4,000. Adnan keeps the 1,000 she has made. Adnan, who is well known at Dixons plc as an agent for Aniela, contracts to buy ten plasma screens from them for 7,500. Advise Aniela on what grounds she can sue Adnan