According to the Maliki school of thought, what prevents one from marrying a girl: marrying her mother, then looking at her with lust, or touching her with lust, or marrying her mother, then having intercourse with her?

The foreplay of intercourse—such as touching with lust, kissing, and looking at parts other than the face—makes the daughter of the contracted woman unlawful. The daughters of the wife do not become unlawful merely by the marriage contract, but rather by sexual intercourse or its foreplay, such as enjoying a kiss, direct physical contact, and looking at the inner parts of the body with lust. The entry intended in the verse includes any form of enjoyment, even without sexual intercourse.