Zara Tindall was “left distressed” over Princess Anne’s injuries, according to sources, which saw the royal in hospital for five nights. The Princess Royal’s accident is said to have left her “worried” daughter “shaken to the core” following many years of worrying about her mother. The 73-year-old was taken to hospital after being struck by a horse at her Gloucestershire estate last week. The Princess Royal’s husband, Vice Admiral Sir Timothy Laurence, has since praised the medical staff who looked after her at Southmead Hospital. Sir Timothy confirmed that Anne is “recovering slowly” followin…