her studiousness was part of her survival strategy in a family where she was apt to be left in the shade( not beign as pretty as the others-and with such a mother):

...she( Elizabth-JW) was eagerly succeeded at the instrument by her sister Mary, who having, in consequence of being the only plain one in the family, worked hard for knowledge and accomplishments, was always impatient for display.

Mary had neither genius nor taste; and though vanity had given her application, it had given her likewise a pedantic air and conceited manner, which would have injured a higher degree of excellence than she had reached. Elizabeth, easy and unaffected, had been listened to with much more pleasure, though not playing half so well; and Mary, at the end of a long concerto, was glad to purchase praise and gratitude by Scotch and Irish airs, at the request of her younger sisters, who, with some of the Lucases, and two or three officers, joined eagerly in dancing at one end of the room.