enough to do sth.是程度状语,含义是"足以"。
基于《剑桥英语语法》的视角,一小部分副词可以有自己的补足语,见书中第58页:However, only a very small number of adverbs license complements, as in independently of such considerations.,其中of 介词短语就是副词independently的补足语。
网友的句子对应书中第1262页的Indirect and matrix-licensed non-finite complements下Infinitivals indirectly licensed by too, enough, sufficient, sufficiently的内容。按照书中的思路分析,网友的句子中,to ask her to luncheon是间接补足语(indirect complement)。enough允准to ask her to luncheon,但to ask her to luncheon依赖于well enough中的中心词well,而不是直接依赖于修饰well的enough。
总结:to ask her to luncheon是补足语——间接补足语。
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