everytime my daughter gets her oil change it reaks some odor for a long time. could this be something serious?

What is your question?

its a 2002 cavalier with eighty some thousand miles. they want to replace oil pan gasket. Im a woman and do not know much about cars.

What makes this problem better or worse?

anytime when oil is changed

How long has your 2002 Chevrolet Cavalier had this problem?

a year or more