A male and a female engaged with katb al kitab. But the parents of the girl made a شرط that there will be no “love making” till marriage. But even though her parents made that شرط they still made love. Is it considered zina?

In Islam without Nikah in any condition it is not permissible that a non mahram men and woman have such relation which leads to touch each other while it is not considered as a Zina but it is Haraam and even a non mahram men and women are not allowed to flirt so in case if parents are allowing you do not have sex and just make love with each other only if they have done Nikah ( either temporary ie. Mut’a or permanent) otherwise in any case without Nikah it is Haram to have any relationship with ones who is non mahram.