-- she'll ask you to make her a pot following a design she gives you. To start, click on the shelves next to the kiln, where the blank vase is ready for you to decorate.
The shapes at left are stamps that you use on the vase to add the design. Click on the picture Niobe gave you to see that it has a horse in the center.
Click on the horse shape at left, then click it on the vase where you think it should go. Then add the designs at top and bottom (vines and squares). It doesn't have to match the design exactly. In fact, you don't have to follow the design at all if you don't want; Niobe is a real artist and will be happy with whatever you do.
When it looks good to you, click on the "Fire" button to put it in the kiln.
You now have to wait for it to be fired. In the real world, this would be a couple of days; here, it's a lot faster, but it still takes some time. Go explore the Underworld (like, look for that remote, maybe), then come back. The lights on the kiln are red when firing, blue when the pot is done, dark, when you take it out.
And that's it! Finished vases go in the cupboard on the right. You can do more if you want, as many as 12, and this time you don't have to follow any design but the one in your head.
When you take your first pot out of the kiln, you'll see a shard from one of Niobe's pots that Nancy comments on if you read the note in the trash can. Make sure you ask Niobe about it.