Sweet alcohols, or others good for people weak to bitter tastes?

Long story short, my partner is super sensitive to bitter tastes and most common drinks tend to not really taste good. She describes them as tasting rotten usually, beer and wine being the worst offenders, and spirits being practically poison with how she reacts. But she does want to find a drink that works.

We’re experimenting some with cocktails when we can afford it. But apparently a lot of those also have that rotten taste. Does anyone have suggestions that might get around this?