As a reward for outstanding performance during the Wager Task, Biggie released the key to the fridge to Ozo the Head of House so the Housemates could celebrate with their favorite brand of alcohol.
Ozo, however, kept the key away and didn’t announce to the Housemates as he was waiting for a certain ‘someone’ until Dorathy found out.
When the Deputy HoH realized the certain someone behind Ozo’s hesitation to open the fridge was Nengi, things got sour and she was so upset to the extent that she wasn’t even willing to hang out with the rest of the Housemates when the fridge was later opened.
Ozo noticed and came to placate her but she still didn’t give in.
She later opened up after much appeal that she was very upset when she heard Nengi defiantly say he was waiting for her before opening the fridge.
This, according to some viewers of the show, is because Dorathy is catching feeling for Ozo and is jealous of him waiting for Nengi.