Yes, or like Garret wrote, she might even want to stop living ( which is an exaggeration of course) but that's how bad she wants to succeed.

Can have different meanings for different people in different contexts. Given the context you provided, I would guess she means that everything she has done in her life so fa is irrelevant and was not useful in helping her succeed in the task she is trying to not fail in. In other words, she would look at herself as a complete failure if she doesnt succeed.

It means to cancel everything, or to stop living even.

I think this means "di*"... I don't want to type the whole word here, in case I get banned by Italki again for using "incorrect language". Sorry, you will have to guess what the third letter is, or look in my previous post...