if she is filipina, and if she is here, on transfer maid status, then you can breeze through, but, when she goes home for holiday, she will be subject to a lot of pain, for POEA / OFW works. .
You can do the same on your own, but with the maid cartel ensuring that the Philippine end is tighter than .. whatever, it is tough.
Indonesian maids, on the other hand are less trouble, and so are the Myanmar maids ..
You can always negotiate with an agency to breeze the paperwork through, if you have identified the candidate ... then the agents charge you about 300$ for the paperwork, getting the proper approvals etc..
and for the 7 employer in 2 years, don't blame the maid .. I know a couple of employers who have been switching maids every three 3 months or so till MOM blocked them from no new maids .. and like those in employment, sometimes the employee is unlucky .. like if the employers tend to move out of Singapore ..
If she has been bad, she will not have a job here .. for a start .. one of the 7 would have blacklisted her out .. trust me ..