even for a tiny person 1250 is very low. how much do you eat now? if you are wanting to go under 1400 cals it's crucial that every bite count: liver, eggs, bone broth/gelatin, quality meats and fish; tubers, fruits, veggies. no crap snacks.
as for the macros, everybody is different so you will have to play around and see what works. if you want to go vlc to start, say <20 gms, you may need to ease off on the running in the beginning. vlc will whack out your electrolytes too, so drink plenty of salty broth.
are you sure you don't need to work on body recomp, vs. restrict cals so much?
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway