Finding the Useful god - Case 34

This is from my 28th reader.

1. Esther Ho
2. Female
3. 3rd February, 1984
4. 7.26 pm
5. Singapore
6. Chemist.

This is a weak ding day master and also a cai-guan-yin chart.

What is her Useful god?















Obviously yi wood to keep the ding fire glowing.