Your stats might very well be correct but the premise behind them and the conclusions you draw from them are shaky at best. I mean, it would be nice if simple statistics could solve cases like this but at the very least you have to put some thought behind the numbers in order to come up with anything meaningful. For instance, it would probably be relevant to find out what percentage of suicides go out into unfamiliar woods and then kill themselves in such a way that their body won't be found for over a year. And also how many do it right after packing their bags getting ready to go on a trip. Plus there is the lack of a suicide note or anything else that might indicate why she would commit suicide. How many suicidal women do that? Maybe some would, such as a complete loner, but she was hardly that and i can't imagine she would be so callous towards her parents and friends as to put them through the agony of not knowing what really happened to her. I think when you put all that into your calculations the ratio between suicide/murder would change significantly.
What percentage of suicides go out into unfamiliar woods and then kill themselves in such a way that their body won't be found for over a year? And also how many do it right after packing their bags getting ready to go on a trip? Plus there is the lack of a suicide note or anything else that might indicate why she would commit suicide. ... I can't imagine she would be so callous towards her parents and friends as to put them through the agony of not knowing what really happened to her. I don't have specific research for you but many people go out in the woods to kills themselves, it's a popular place. That she wasn’t found quickly, just a few miles from her apartment, is not her fault but the fault of an incompetent police search. Many people, possibly most, do not leave suicide notes, for example Vince Foster. This happens in cases where the person wants to disappear and does not want to or can not rationalize their decision. One of the side motivations for suicide is to punish people, so being callous towards friends and family is hardly a deterrent in the mind of a suicidal person. Or she may not have left suicide clues because she did not want to hurt her family, wanted to leave them the benefit of the doubt. Unless Chandra was a drug user and tried to leave without paying off her drug dealer, or had someone else very angry at her, the odds appear to me to be very low that she was murdered.
Do an advanced google search on the phrase "no suicide note" and you'll find lots of similar cases to this.