you dont need agent.

1. Get her passport renewed
2. visit immigration office - in person to stick the visa into new passport
3. go Fomema - now every year must do, not like before after 3 years not required
4. Apply renewal online

Only one time you need to visit immigration is to change the visa to new passport. if an agent charge you RM200 is worth. save your time. if you are not working then go do it yourself.

hope this helps.