Austrian pianist. Pf. and comp. pupil of Mozart, who in 1784 wrote for her his pf. concs. No.14 in E♭ (K449) and No.17 in G (K453) of which she gave f.ps. in Vienna. Also played the sonata in D for 2 pf. (K448) with Mozart. Daughter of Court Councillor Gottfried Ignaz von Ployer, from 1780 agent of Salzburg Court in Vienna.