After you visit Maria at the beach during the weekend and play with her in the pool, she instructs you that she will take you to her work at the lab on the following Monday morning, and she will visit you that night when you go to sleep. The following Monday morning, she will be blocking the door out of the ground floor of your house to take you to her lab. If you do not go with her, the mission will be flagged as failed at 14:00.
If you have edited variables for the Maria quest or you have loaded a save from a version previous to v1.6, this can corrupt that quest causing her to not appear Monday morning.
The quest should be valid when (note: a switch is off if it is false or it does not exist):
- Variable 38 "Quest Mom" should be 10, but definitely less than 20.
- Switch 199 "Mom Noche After Beach" should be off (Maria has visited you at night after the beach).
- Switch 180 "MISION TRABAJO MARIA." should be on (You visited Maria at the beach).
- Switch 220 "MIsion Trabajo Mari FAIL" should be off (You have not yet failed the lab quest).
- Switch 500 "PApa Vuelve" should be off (The day your mother takes you is not the day your father returns).