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>>“I tell the traditional Christians that worshipping saints is not good; you have to worship God.”
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>The Evangelicals are teaching her some truth and some ignorance at the same time. They have convinced her that veneration is adoration.

I think the key here is 'worship', to worship a saint is to give what is rightly God's to another.
As Revelation 22 says:

I, John, am the one who heard and saw these things. When I heard and saw them, I fell down to worship at the feet of the angel who had shown them to me. But he said to me, “Don’t do that! I’m a servant just like you and your brothers and sisters, the prophets, and those who keep the words of this scroll. Worship God!”