Thanks everyone for responses.
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fern46 : Yes she is taking medication and we are working with a Psychiatrist
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BirdDancer: My sister has no issues with her hoarding tendencies, but at home it makes things problematic. A room is unusable bcoz its full of stuff. So she never raises it with Psychiatrist.
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raging_vortex: Thanks for sharing your details. Do you take any steps or any medication to help with hoarding tendency?