stray cat, please help!

hi! about 2 days ago before the supposed storm, a black and white kitty showed up at my porch meowing like crazy. i can’t bring her in my house, as i have 2 kitties already and can’t risk diseases, pests, etc. i’ve been feeding her, giving her water and love, and i made her a makeshift area for comfort and warmth from the outside.

i think it’s a girl, but i’m not sure.

she’s located in the antioch area, particularly in apartment complexes on bell road.

if you know anything at all please help me!

she seems somewhat domesticated, she’s very friendly and loves pets, gets along with humans fine. she has a small makeshift collar that’s white. she’s very thin, and seems to have been outside for some time. pictures are attached!