How It (Might) Works
Meredith Gordon: Pyrokinesis-
QUOTE("Chevy")
It is possible that her body creates and secretes through the pores of the skin two chemicals, we'll say hydrazine and nitrogen tetroxide.(courtesy of wiki), that when combined, they create a flame. He skin is protected by a third chemical, vaseline like, that makes her impervious to the flame catching her skin. The reason I think vaseline like, is because it can also be used as tinder when coated on cotton balls. The combination can easily be ignited by a fire starter, burning hot and long, but the petroleum keeps the cotton from getting wet. If the cotton ball is protected, then so should the skin.
However, she cannot throw fire balls, because there's nothing to sustain the flame once it's left the chemicals. No 'fire streaming' from the body, again, she cant 'shoot' the chemical outward. Also, theoretically, she could ignite her whole body, similar to Johnny Storm, minus flight and superspeed.
Again, however, her clothes would burn off; unlike Claude, she cant manipulate her clothes too. She can't make them impervious as well, rational yes, possible... maybe if she extricated the chemicals from her body slowly and allowed her clothes to soak at home rather then wash them. But along the lines of 'she can't control her clothes,' therefore, when her clothes caught fire, she'd be naked after they burned away. Her hair was a funny thing... hair has natural oils (I've seen the commercials, you have too) that could theoretically produce the same seelant as vaseline-like properties. Downfall; her eye's would have to remain closed, the pores on her eylids blocking the fire from scorching out her eyeballs (which produce nothing of the sort of chemical needed to stay impervious, minus tears).
Now the 'why not manip? she burned down her house...'
Well, we don't know she shot fire from her hands... maybe she fellasleep, cigarette in hand and it fell onto the rug. we aren't sure she started the firewith her abilities even. If she did, however, then if she can manipulate fire. Why not cause the flames to burn out?
But, the only thing to dissprove my theory, one of many actually I'm sure, is why she doesn't have really bad rosatia on her face and arms... if the body is secreting all these chemicals to produce a chemical reaction starting a flame, why aren't theses 'natural' oils clogging up her pores, causing bad acne or blackheads. Or is it because she has that kind of control over her bodies chemicals that she can keep it 'clean, clear and under control...'