What is the lowest figure for her age when the year of marriage is before 1853, the number of children is less than 8, and the bride was Eliza Maria Partridge?
CREATE TABLE "chart_the_eight_wives" (
  "year_of_marriage" real,
  "name" text,
  "her_age" real,
  "his_age" real,
  "num_of_children" real
);
SELECT MIN("her_age") FROM "chart_the_eight_wives" WHERE "year_of_marriage"<1853 AND "num_of_children"<8 AND "name"='eliza maria partridge';