What is the line of text under her name?
Her room topic, and it is worth reading before you type anything. Most of these women use it as a tip menu: what the toy costs, what a particular request costs, what she is working toward tonight. It is printed on her page here as well as in the room.
How does toy control work?
She wears a toy that responds to tips. You tip, it goes off, and how long and how hard depends on how much. Three in four of these rooms have one running, which you can see on her page, and it is the usual reason a free chat gets anywhere.
What is the difference between skinny and athletic here?
They are separate values she picks on her own profile. Skinny is the slighter frame and athletic is the trained one, athletic is the larger of the two on this site, and both have their own page.