Ruby was getting restless. Ash had refused to let her leave the barrier for over a week after they got back just to be safe but it also meant she wasn't able to go out and get any of the things she wanted to make this drafty castle homier.
She thought he was being paranoid but couldn't brush off the worry in his eyes because she knew he was only like this because of his recent loss. He didn't want to lose her too.
So she spent a lot of time cultivating the garden and summoning endless heaps of jewels in preparation for when she was able to get back to a big city and sell them. She used her smartphone as a design reference, which was rather helpful in allowing her to branch out.
Ruby was nervous about testing her powers on other minerals so she stuck to what she knew. That sort of power came with an awful lot of responsibility she did not want at all.