Rather with her money and his tithe - אלא בזוזי דידה ובמעשר דידיה
Summary
According to רש"י by זוזי דידה and מעשר דידיה she is exempt from paying the חומש, because it is not considered her מעשר; however תוספות maintains that women in general (who are single) are exempt from paying the חומש by מע"ש. They also argue what is meant by זוזא דידה.