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When Rimuru became a Supreme Goddess, she acquired four Daos, the Dao of Ocean, the Grand Dao of Slimes, the Grand Dao of Absorption, and the Grand Dao of Spiritual Elements.
Since then, she had been practicing their power greatly and also cultivating her rich supreme domain the same way I do, by absorbing materials of her elements and buying them from everywhere, making her own vast divine realm into an even vaster area.
She had been developing the power of these Daos and had already crafted a couple of new Path Jewels around them, that utilized their full combined power to release all sorts of powerful abilities and attacks, alongside passive effects.
Alongside that, there is the Fragments of the Daos I have which I've shared with her, making her even stronger with them. The Dao Fragments I had let her also summon her own Maxima Summon, which has been training with her and using its own Daos to enhance her battle prowess.