Your kitties are very pretty! I think they will just need more time to acclimate to each other. I think you should consider keeping them separated when you are not paying full attention to them to avoid confrontations. Try the two-handed wand toys as suggested above to try to get them to play side by side, but also definitely give extra alone time with Kebi so that she knows she is still special and loved by you. Some folk swear by the Feliway diffusers to help calm animals, I have had mixed success with these - it is very individual with the cats. This may sound weird but you can also try a drop of vanilla extract on Kebi's nose - see if that will calm her down (masks Akila's real scent and might make her more acceptable).