Xiangyun didn't say anything too much when she won the lottery, but she may have some mentality of watching good plays, which made Daiyu subconsciously not want to drink the wine.
On the other hand, it is well known that Daiyu is in poor health, and drinking too much at night will make her uncomfortable. She usually pays more attention to herself, so it's not surprising that she doesn't drink at this time.
From a purely personal point of view, I think that if we don't study the Red Mansion so carefully, it will be harmful to our health. Just understand the author's intention.