she is not my mom.....

Hmmm it sounds like she might really be a meth head, from so many things you said. The super energy, cleaning/organizing, belt sanding an old dresser (my friend who's a recovering meth user calls that a 'sketch-project.) Skinny and weathered-looking. Has no place to go/nothing to fall back on.

Notice if she eats on a normal schedule or just occasionally.

If she's a meth head you need to get her out of your lives ASAP, she will only cause your Dad and you misery.