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I am very sorry to learn of this situation.
While your mother (I assume that your mother is the only title owner on the property), is the only one that can perform the eviction, given the nature of this situation (you have a hoarder that has moved into a an elderly person's home, and the elderly person is unable or unwilling to establish their own rights) - this is when you need to report the matter to Adult Protective Services.
Alternatively, you can consider petitioning the court for a conservatorship/guardianship of your mother (this would give you legal control authority over your mother and her property - enabling you to evict your sister).