Hmm.... this is exactly one of my current curiosity.... Decade Luck has Fu-Yin with Annual Luck .... My assumption is enhancement of Decade Luck and triggering its interaction with the chart...
With Gui-Si LP and AP, Gui should be herself or people close to her, while Si-Snake can be both Bing-Fire=Wealth and Wu-earth=Officer which has Clash with Hai-Pig at Spouse Palace and Combination with Chou-Ox at Hour Branch
It seems to me like event related to spousal relationship.... However, there is no Resource to show marriage certificate ...
Therefore, I would try a guess that she has spousal relationship but no formal marriage with someone being quite old, rich who she has known for long ....