Board Thread:Theories and Speculation/@comment-36342497-20180726162715/@comment-24572728-20180801155313

Being able to use Boil and Lava does not mean she can use Mud. Mud release, if canon, would in my opinion require being born being able to use it. It's not that she can use those 3 elements ergo she can use can combination of them, but because she has the Kekkei Genkai for Lava and Boil she can use them. It's like she has a pre-disposition to use Fire/Earth or Fire/Water jutsu, but maybe she has no ability to use Earth/Water. But remember, this is only my opinion, we do not know enough on KG and nature transformations.