It seems you can do nothing right now. Just waiting for her to make up her mind(give up baby or not). If she keep the baby, you must consider to keep the maid or not. But don't encourage her anything, keep away from the trouble.
I can think of (imagine) at least 2 possibilities -
1. Her period is late and she THINKS that she is pregnant, but hasn't confirmed yet. She did not take pills nor any other form of precautionary measures.
2. She is married in The Philippines, but has a bf in HK and the baby is the bf's so she won't keep it and doeesn't want to let her family know.
I also know that the DHs (both Filipinos and Indos) can buy herbal medicine for abortion, costs a few thousand dollars.