You've got a very tricky situation that needs immediate attention from a probate attorney. I'm wondering why there is not a conservatorship if she has assets? I would be happy to discuss this with you in detail. Call me.
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In each of the capacities your sister has (Guardian and Trustee, according to your question), she has a fiduciary obligation to act in their best interests. While this is not about you, their expressed intent is relevant in determining what is in their best interests but may be overcome by necessities related to their situation. In each capacity mentioned (Guardian and Trustee), she can be challenged in Court by questioning whether her actions are in their best interests. Her threat to cut you out of your inheritance is a bullying tactic that would not be allowed by a court but a court does not have the ability to correct all wrongs and could only address the issue by awarding damages. You need to contact an estate planning, elder-care attorney to discuss and address these issues. Since you are in the Detroit area, I would recommend that you call James P. Frederick, an experienced attorney, whose office is in Livionia, Michigan
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You should consult with an attorney immediately. You sister may have the authority to sell the home if that is necessary considering your parents' needs. However, she probaby does not have the authority to dispose of their personal items from the home to her friends and she certainly does not have the authority to threaten to cut you off. Consult with an attorney.