Is it permissible to take from money that originated as an interest-based loan?

There is no harm in taking what your sister gave you, as the prohibition of usurious loans is tied to her accountability, not to the money itself. As for your sister's action of borrowing with interest, it is forbidden, and she must repent sincerely with remorse and a firm resolve not to return to it, along with abundant seeking of forgiveness and good deeds, and promptly repaying the loan if that expedites freedom from usurious interest.