Nice descriptions of the heat, Widget! I also like how you express her frustration and how her mind works while she's walking.

One thing I noticed that you might want to work on is your comma usage. Early on, you have a few sentences that need commas, but don't have them. Like the sentence, "After everything else that has gone on this week the car had to die." There ought to be a comma after "week".

I highly recommend "Eats, Shoots and Leaves" by Lynn Truss. She has some good information about commas. Sometimes, it helps to read your story aloud; that often gives me an idea of where I have a comma I don't need or where I need one. If you pause every time there's a comma, it gives you a good sense of when they're needed.

I'm looking forward to reading future stories from you.