Jonas was one of six children of John and Henrietta Jonas of 35 Prospect Place, Southwark; an 1851 London directory described her father as a "gentleman", so it is likely the family was a prosperous one. Jonas began piano lessons at four years of age and later studied with pianist and composer
John Field around 1831–2; her public debut was at a concert of his in March 1832. In September 1832 she twice performed command performances at
Windsor Castle. In 1833 she performed several times on the same bill with
Niccolo Paganini. She later studied with
Ignaz Moscheles. She was given a scholarship at the Royal Academy of Music in 1836 and re-elected in 1838; she studied there with Moscheles and with
Thomas Attwood (until his death in 1838). She continued to perform publicly the music of
Felix Mendelssohn, her teacher Moscheles, and others with success. ==Later career==