Melati is in the east enclosure with Chinta and Heran. She often prefers to be indoors and can often be found in her favorite spot on a platform at the far right of the enclosure, see below:
I wanted to include a picture of Melati here, but most of the images I have were taken with a pretty bad phone. I’ve tried to get one a few times since creating this post, but they’ve either been bad photos or she was in another area when I was there. Hopefully, I will have better luck in the near future. Or maybe if anyone else has a good pic that they want to share?