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So far, my top suspects (and reasons for suspicion) are as follows:

Vali
Her behavior, acting flustered and wanting to quit suddenly after the murder seemed very suspicious to me. Maybe she quit because she was the murderer.....
Another reason for her behavior could be that she knows who it is....

I suspect all of the maids, as they all had access to knives at any time... working in the kitchen and all.... And some of them just might have the proper motive....
Katzz- As a maid, knows how to use knives
Cat Toji- She was already in a fight with Kara, maybe she wanted to finish it up once and for all...

Taire
All I really noticed was a sudden change in mood after the murder... first she was bored, but after the murder, she got excited... and entertained. That just seems a bit suspicious to me.

This last one I HIGHLY doubt, but it's still a possibility....
Tara
I know she wouldn't kill her own sister, but sometimes sibling rivalries get way out of control. Jealousy is a good motive. But as I said, I highly doubt that it was Tara.

Also, all suspects may have been in it for the valuables that Kara had. If someone wanted them desperatelt enough, it's a short path from desire to murder....