The young royal is the oldest daughter of Sophie, Countess of Wessex, 56, and Prince Edward, 57, who have stepped up to support the Queen since Prince Philip’s death in April. But it is Lady Louise’s artistic talent which has led to access of treasured family relics kept at Balmoral.

       According to a royal insider, the Monarch allowed Lady Louise, 17, to see Queen Victoria’s Highlands art pieces.

       The source told the Sun: “Because of her obvious artistic skill, the Queen allowed Louise to look through some of the collection of Queen Victoria’s Highlands sketches which are kept at Balmoral but are rarely dug out these days.”

       The insider added: “The Queen loves the fact that Louise and James relish their time at Balmoral, and she has become particularly close to Louise, who seems to have become her favourite grandchild, closely followed by James.

       “Louise also endeared herself to everyone by looking after William and Kate’s children when they were up here.

       “Louise loves drawing and sketching and was very patiently trying to get Charlotte to do pictures of rabbits and deer.”

       Lady Louise is is the Queen's seventh-born grandchild and 15th in the line of succession to the British throne.

       However, the royal could be set to take up a major role in the Firm when she turns 18 later this year.

       According to royal protocol, Lady Louise will be able to decide if she wishes to take the title of HRH Princess Louise.

       Her parents decided against giving Lady Louise or her brother, James, Viscount Severn, 13, HRH titles at birth.

       Non-senior members of the Royal Family are expected to have normal jobs to earn a living.

       Speaking to the Sunday Times last year, the Countess of Wessex said: "We try to educate them with the understanding that they will most likely have to work for a living.

       "That is why we made the decision not to use HRH titles.

       "They have them and can decide to use them after 18, but I think it is very unlikely."

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