First of all, you need to go to the villager's home in mayan tribe... then at the moment you enter, you will have a cut scene where in her mother accepts shasha to be offered...  after this, talk to her mother and she will ask you to get her daughter back.. . after this, you can walk outside for the real start of the quest... 

after you go out, you can now go on the hole in the village...  there, tyou can talk to the priest and he will ask you to join their ceremony...  after this, you can wee a cut scnene wherein shasha is walking towards the hole and then she went down...

after the cutscene, you are ready to go down... just go towards where shasha went and you will fall on the hole (like how you fell in elin's quest) and you will land on the cellar...
eft side, you can see a head of an animal... click it and the door will open... go inside and you will see a question mark... go towards it and you will see shasha lying on the ground...

talk to her and you will see an alien trying to get her... therefore, you will know that there is NO REAL OFFERING! it is just like an offer to the aliens because all the offered people are just eaten by the aliens... you will be needing to defeat the alien...

after you defeat the alien, shasha will join on your team FOR A WHILE  (note: you need one pet slot for this) and then, you can go to the left part of the room and you will see the exit... go there and you will see yourself jumping on the mayan tower (near the players to play football XD) and then you will go back to her house... after it, shasha will leave you FOR A WHILE  and then, you talk to her parents, they will say that shasha cannot stay in the village for a long time so she needs to be with you... you will accept and shasha joins your team including one magic carpet as reward...

(*note: to do shasha death quest, need to have her 70 amity and go somewhere in the forest in mayan then she will sacrifice her blood in order for you to be able to leave the cave... xD)