Your girl does not sound like the typical Mal
Our Mal is now 2 years 3 months of age, before the age of 2, regardless of how much we exercised her (physically and mentally), she only settled down if we put her in her puppy pen or in a crate. Outside of training, the longest she had ever laid still was 20 seconds (literally), if she was not in a pen/crate, she had to be doing something, or else she would find things for herself to do.
We've been actively training her in Mondioring since 2 months of age, we took her to puppy/beginner OB classes for socialization, dabbled in agility to give her extra outlet, and now taking nosework classes (on top of Mondioring) to keep her busy.
In the last couple of months, she started to occasionally lay down by us (for up to 15 minutes )when we were busy, first time she did it, I checked her all over 'cuz I thought she was sick :rofl:
In another year or so, she should have a functional "off button." We've seen a good number of Mals in different dog clubs, I think ours is only "medium" in terms of intensity and energy level