How can a stranger edit my tree? And can I stop her from doing it again?

Recently a total stranger edited my tree.  Without my permission she merged a duplicate profile, then removed that person from the parents and siblings, and now I cannot find my relative in my tree!  

This person is not a family member, has never contacted me for permission, and I have no idea who she is or why she seems to think she can just jump in and mess with my tree.  I am pretty irritated at this, as this is not the first time I've noticed people merging / revising my tree, but at least they've never lost anyone before.

When I joined geni.com I had no idea this was allowed, as there is not an easy to access FAQ that I've noticed.  I'm on the verge of completely removing myself from this site over this, as I do not want strangers editing my tree without my permission or knowledge.  I don't care if geni is supposed to be a 'global' tree, my family is MY family, and the thought of someone taking control of my tree information irritates me.  I mean, how do I know that the information they are adding is accurate?  

Any help would be most appreciated.


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