time for booze
This is a valuable continuous quest that allows you to collect Diamonds for crafting needs.
You can find Brand Champagne in the refrigerators of the Banoi Hotel's kitchen, the Supermarket, and in some lockers and safes in the Jungle and Laboratory. It is also a fairly common drop in the refrigerators of back rooms of the Abandoned House safehouse in the City of Moresby.
so basically you dont need to go into the hotel for any reason for this quest. its basically a unless quest that you will never finish. you just keep giving that drunk champagne and she will keep asking for more.