I'd watch my back if I was Jasmine.

I've seen no evidence that Casey hates Jasmine. She may well nominate her though given the chance.

I think she quite likes Jasmine.

Jasmine, once she realised the nature of Casey's earlier relationship with Lee sided with Casey against him. Casey, in turn has offered to help Lee get back with Jasmine.

I haven't really seen any signs of Casey disliking Jasmine.

Yeah, I don't think she hates Jasmine at all. She seems to rather like her actually.

I don't think she hates her, just jealous of her.

Jasmine instigated the whole thing. Lee was lying down trying to sleep; she called him. SHE KNEW he kissed Casey.