Princess Anne is the British royal family’s “hardest-working” senior royal, and that work ethic is said to have her in a “fury” due to a reduced workload after her five-night hospital stay. Rhea Freeman, a fellow equestrian who knows the princess, revealed HRH will “not be too happy about her change in schedule.” On June 23, the Princess Royal suffered an “out-of-nowhere blow to the head” on her Gatcombe Park estate. After several days of receiving treatment in a hospital, Anne, 73, has been released and is recuperating at her home in Gloucestershire. Her children, Peter Phillips and Zara Tind…