Sacar tajada

Sacar tajada
 

SAcar tajada means to take advantage of sth, when you give sth to sb or do sth to sb you have to take advantage otherwise you don´t do it. Is there an expression in English?
Example:

Mi sobrina siempre tiene que sacar tajada si no se embarca en ningún asunto.

Not really a direct translation, but "My niece won't do anything unless there's something in it for her."

To squeeze it dry. To drain the cup dry.

So what would be the best way for "to take advantage?":cool:

to take advantage of something/someone (good connotation) = aprovechar algo, sacarle provecho a algo/alguien
to take advantage of someone (bad connotation) = aprovecharse de alguien