Since Lilli is mainly a plant she really enjoys the water. Meditating under a waterfall is something she can get lost in doing for hours, sometimes even days. She'll wake up after a day or two sometimes and have flowers dotted all over her fur.
Hot showers and baths are also a favorite. If she stays in for too long in hot water, tannins will start to dissolve in the water, effectively turning it into a rather tasty tea. She'll momentarily lose some of her sheen and luster though but it's quickly replenished again.

Realized I hadn't posted this here so I might as well.

By:  Zwiebelprinz
https://twitter.com/Zwiebelprinz