Details of the step in renewing Filipino Maid Passport can be found in Philippine Embassy websitehttp://www.philippine-embassy.org.sg/consular/passport/applying-for-a-philippine-passport/
Frequently Asked Questions about renewing Filipino maid passport can be found in the following links
It will take about 8 weeks.
It is about $102.
Because of the verified employment contract issue and the time consuming process involved, many employers opt to use maid agency to avoid the paperwork and queue.
Cost of renewing the passport through agency may be at about $400. Please check with your maid agency for details.
Please be noted also that your maid has to go down personally to the embassy to renew her passport even you engage a maid agency to help you.