She suspects her drink was roofied because she has no memory of that night.

roofied 是动词 roofie 的过去分词形式，roofie 来自毒品 Rohypnol（罗眠乐）的俚语称呼，指"在饮料中偷偷加入迷药"的行为。roofied 在这里表示"被下了迷药"的被动状态。