I disagree with you that she had her own group.
Because I specifically remember at the time when she was crying in the diary room (a very memorable moment of BB for me, so many feels for the first time watching BB), that she had no one to go to. Everyone sort of had their own companion to talk to, whereas Tahan sort of was friends but not very close with anyone. I'm fair sure this was true, because I remember thinking at the time I felt really sorry for her because of it.
Tahan then became good friends with Tim, Drew and Boog towards the end of the season when there weren't many people left in the house.
She did have a group, but most of them had been evicted by then. She had a very strong clique with Tully, Matt, Caleb and Xavier from the halfway house, and then Ed, Heidi and Jaz joined them. The whole reason Mikkayla attached herself to Jade and Katie/Lucy to begin with was because her original halfway house group isolated her (Tim said it himself). However other than Ed they all started to get evicted one by one. The scene you're referring to happened after pretty much all of her friends had been evicted. I remember when it happened thinking she didn't have anyone to blame but herself because she made it extremely clear when her own clique was still in the house that she had no time for most of the people that were still left in the house at that stage.