Answer:
No, Anne can't do this.
Explanation:
Anne is acting as an agent which means there's a principal -agency binding contract and underlies the laws and duties that Anne has to perform keeping in her mind. Anne's duty is to act for the benefit of the principal i.e. owner of Marshall mechanical contractors ,such a duty is called fiduciary duty. A duty based on trust and loyalty.
So if Anne were to go and buy the land using confidential information and acting against her duties levied on her by law ,it would be a violation of fiduciary duty .