Thanks. 

Client status in 2019 was single and had earned income.

Her status in 2021 was married jointly and her husband had no income in 2021.

Client earned income for 2019 when she was single had been more than 2021 when she was married.

My question is : since her status for 2019 and 2021 are different can I use client 2019 earned income for EITC 2021?