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"But there is strong evidence that she was a heretic."

"Heresy" is defined not by Jesus but by later church authorities, who interpreted the life and sayings of Jesus in ways that are seemingly at variance with many passages in the New Testament itself.

Mother Theresa may indeed have been a heretic as defined by the Catholic Church or Protestant evangelicals, but in my opinion those groups are themselves misinterpreting the Bible in significant ways. And, in fact, those two groups regard each other as heretical in some ways. And Jews and Muslims regard Christians as heretics, and vice versa.

The Catholic Church - and most Protestant churches - usually tolerate low-level heresy among their members. I'm sure a survey of Christians would show that a large percentage of Christians attending church hold one or more "heretical" views regarding Jesus, salvation, sin, the church, life after death, hell, the sacraments, etc. And I'm also pretty sure this is not a recent development, but has always been true.

The Catholic Church tends to punish heresy only when it becomes public and a matter of enforcing church discipline, as when a priest or bishop openly defies authority in either a practical or doctrinal matter. But the average believer believes according to their ability and their own experience.