Hey, firstly, I really like this, I want to learn more about the characters already, and that's only from your descriptions in the opening scene. It's hard to grab readers into your characters lives first off the bat, but you handled it exquisitely. I have a few qualms about the way you structured it, but this could just be due to personal taste and writing style. Not wanting to rewrite the whole thing, because that isn't helpful in the least, but I will point out a few things that I had slight qualms about.
Firstly, I thought the opening paragraph works very well, with the "in a cloud of dust" part, although a tad cliche, working very well, and contrasting well against the character of Tara.
"Instead, she turned the key partway and turned on the radio before rummaging in her purse for a few minutes. She pulled down the sun visor, opened the mirror, and took out a small eye pencil." - The repetition of the word 'turned' is the main worry in this sentence. Perhaps you could have: 'Instead, she turned the key partway and then leant forward to turn (or switch) on the radio, before rummaging in her purse for a few minutes. She pulled down the sun visor, opened the mirror, and took out a small eye pencil.'
The third paragraph is well written, and you manage to add some character details into the process of applying make-up; very creative. You also draw description to the simple things that people might try to avoid, but it works brilliantly here and adds to the character and situation.
In the fourh paragraph I think the tense of the folllwing sentence should be changed: "She reached into the purse again and brought out a lip liner." - Perhaps change the tense so that she is reaching into her purse, like this: 'Reaching into her purse again Tara brought out her lip-liner, bringing it up to her lips.' This would then make the next part: 'She outlined them with the rosy-pink pencil and then colored them in with the same care that she took as a child with her coloring books. Finally she put just a bit of gloss on her lips and put the makeup away.' - Of course that might be more of a preference.
In the 6th paragraph the word 'stoop' causing me a distraction, but it might just be my unfamiliarity with the word and its uncommon use here in Australia. Also in that paragraph is the line: “How did you know I was feeling shy?” she wondered. - I think putting 'she wondered out loud' might be best as I thought she was just thinking to herself for a few seconds. Or perhaps just replacing it with 'inquired' or 'asked', whatever suits best.
Well, I can't wait to read the next part of this. I can see you have a flair for writing drama, keep at it, off to read more of your work now.