Does she think that her prayers are changing God’s plan or will? If not, then why is she wasting the time when it’s already going to happen.

But since she knows that it’s you doing the work, that suggests she thinks that people are inherently evil and can’t possibly do good things without some higher influence. That’s a harder one to address, especially when it’s family. I’m just glad that believers have someone in their head guiding them to do good things, otherwise we’d really be in a mess. /s partially