I think that they do get over the psicological aspects very early or else they simply have to abandon. Most professionals take the game level to a point that is pure mathematics. In the same interview, she explained that during the game she just thinks of the money on the table as "firing power" or "fuel left" to be burned and decissions are purely intelectual.
Well, that's fine in theory, but we're all human and even the most seasoned professionals sometimes let emotions get in the way of their gambling decisions.
First I want to repeat a distinction that I often mention in these threads but that most people don't seem to understand: between professional and regular players.
Both types of players are quite similar in that they are long term winners, take poker as a job and take care to make the most rational decisions possible (EV+). The difference between these two types of players is that the professionals are dedicated exclusively to poker and the regulars have a main job but with poker they earn extra income. That and the level of income. The average professional makes much more money than the average regulars, who can be found in micro-limits (although these regular are often people who are learning).
A regular or professional poker player when he bets, if he does it well, is not thinking about the value of the money the chips have, he is calculating an EV+ move in the most emotionally neutral way possible. A recreational player or fish, on the other hand, is usually an occasional player who is thinking about the cash value of the chips, going up if he wins or going into tilt if he loses. In both cases he usually ends up losing soon because even though he starts with a winning streak, due to the feeling of confidence and thinking that he is on a "winning streak" he makes even worse decisions than he would normally make.