OMG, I cannot believe that woman just put those little 6 week old kitties outside. How horrible. I agree with Moosmom that this woman should be reported and she isn't fit to have ANY animal.
I'm so glad that you are there to take care of little mama. I'm sure by the way you describe her that she will have a new home very soon.
Good luck to you and little mama.
My prayers and thoughts are with you.