Learn English – “would love/like to” usage

The first statement,

If I were you, I would look for another job.

suggests that the advised action is something that the person to whom the sentence is addressed can perform to beneficial effect right now.

The second statement,

If I were you, I would have looked for another job.

implies that the action would have been appropriate in the past, but that there is no guarantee that doing it now is potentially beneficial or even possible.

1. There is no IF because she is using a different grammatical form, where you use "Had [subject] [past tense]" to indicate a past alternative that would have led to a different present. Like, "Had I known things would turn out this way I never would have invented that time machine". It's equivalent to the "IF" form but it's less common and a bit more formal. Maybe with more connotations of regret ?

Here is a video talking about several inversion forms including this one (at around 4:00)
http://www.engvid.com/english-grammar-inversion/

2. It is implied she is talking about her life up to that point. "Childhood" wouldn't work because presumably her whole life would have been different, not just her childhood.