While on assignment in Europe, a cut-throat US journalist and tomboy discovers she is the reincarnated queen of an ancient kingdom but must quickly come to terms with her new identity before facing enemies, determined to eliminate her and take the crown.

I've modified it to include what she loses if she fails. Thanks again Rich!

What are the consequences if she fails?

LOL Rich @ "got more from the title than the logline". I must say, I didn't think constructing a good logline was this involved! :-)
Let me know what you think about these versions. Which do you prefer?.
Thank you.

While on assignment in Europe, a US journalist and tomboy discovers she is the reincarnated queen of an ancient kingdom but finds she has to quickly come to terms with her new identity before facing enemies determined to take her crown.

Another version is:

While on assignment, a US journalist and tomboy discovers she is the reincarnated queen of an ancient kingdom but must quickly come to terms with her new identity before facing enemies, determined to take her crown.

I got more from the title than the logline.

How about something like this?
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"When she discovers the tree of life, an American journalist must use newly acquired Holy powers to protect the tree from the demonic forces who want the forbidden fruit for themselves."