The IP address of the Outlook web server is right at the top of the link you posted. Unfortunately, it has come to my attention that the person's 'true' IP cannot be traced through Outlook. The IP, which originates in Redmond, Washington USA is not where the scammer is; rather where the mail servers are. It was worth a shot.
As others have said, you don't want to antagonise your sister by abruptly confronting her. However, it needs to be made clear to her that this is a romance scam, bearing many hallmarks of this type of fraud.
Show her this forum, explain to her what you've learnt, refer her to victim stories of this kind of fraud. It sounds like she is in something of a dream or trance right now; it is apparently very common for victims of romance scams to go through.
You need to snap her out of it, but it won't be an easy pill to swallow, knowing that she has lost money and other items that she will never see again, and that this caring, funny, interesting man she thinks she is speaking with is a criminal and most likely a psychopath.
You also need to instill in her that there is no money, no man coming to marry her; that his only interest is stealing her money from her, and he will invent any ruse, any excuse, any fabrication in order to facilitate that purpose. Once the money is gone, so is he.
I think the best way for you to go about this is to refer her to this site, or others which deal with this type of scam. If she is confronted with evidence that it's a scam, by perhaps seeing or reading about women who have been in similar situations, then something might just click and she'll hopefully come to the realisation that she has been deceived. It really is such a difficult, delicate state of affairs. Please do keep us posted with any updates, or anything useful that might help the cause.
