Table schema:
CREATE TABLE table_name_84 (her_age INTEGER, _number_of_children VARCHAR, his_age VARCHAR, name VARCHAR)

Question: What is the total number of her age figures where his age is less than 33, the bride was diontha walker, and the number of children was less than 0?
SQL: SELECT SUM(her_age) FROM table_name_84 WHERE his_age < 33 AND name = "diontha walker" AND _number_of_children < 0