She related to me that in October 2011 (three weeks after the birth of her child), she performed all 5 of the concertos in one evening--an experience that prompted her to re-examine her way of looking at them and concluding that playing "good Mozart wasn't going to cut it". She began to examine the character of each concerto, and found something very operatic about them--almost as though each has a plot, telling a story. In her words, they aren't "just polite, friendly Mozart".
In addition to the 5 concertos the set includes the Sinfonia Concertante which she performs along with Matthew Lipman, a beneficiary of the Rachel Elizabeth Barton Foundation which exists to promote awareness and appreciation of classical music.
Rachel performs along with the Academy of St. Martin in the Fields, conducted by (the 89 year old!) Sir Neville Marriner. The set is available on the Avie label should you decide to give it a listen.