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