I pretty much knew before the end of the first week of dating that I wanted to marry my wife. We got engaged about as quickly as your sister, but we kept it to ourselves. We didn't announce it for another several months, and then took a little over a year to plan the wedding. Not because we weren't sure, but because of scheduling conflicts with other big family events. That was 16 years ago, and we're still going strong.
My point is that it's possible to just know, and you don't need a bunch of time to figure it out.
I'm not saying that this is your sister's situation, just that it's possible.
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