We have been forcing Batu and Ella to be around each other more often this week. Batu was still pretty scared but Ella was not being aggressive.
This afternoon we left them alone together for quite a few hours. It was longer than we had expected. Fortunately all was fine. Neither showed any sign of fighting and Batu is much calmer now. Maybe they talked it out?
Here is Ella chilling on the sofa. She has just started jumping up on it. Last week that was too scary for her.