Alexander, Miss

23.3.1789 (mes) Alexander at Miss Williams'.
Letters of Joanna Baillie online mentions two spinster sisters that the Baillie sisters had known many years, whose brother was Chief Baron Alexander (18.5.1755 - 20.6.1842). This could be one or both of Christian died unmarried 25.2.1846 in 84th year or Jane died unmarried 7.2.1843 at Dover in 77th year, both left PCC wills