Then again, my mother had the gift of faith - which is more than the grace of faith all Christians have to believe. When she prayed about something, that was it, done deal. She laid it down and walked away - what this author would call "let go and let God."
Most of us tend to pray about something, let go, then pick it up again, pray again, lay it down - on and on.
But mom did not doubt God. She didn't worry, fear or complain. Done deal. Many miracles happened in and around my mother's life. Healing miracles, of course, and more.
So, yeah, the author's position sounds very strange to me.
We are grateful for her example and that you honor her.
I think it is less of “turn it over to God” but more like “the lilies of the field”. Don’t worry about what you will eat or what you will wear (like the Pharisees did) but trust that God knows what He is doing.
Too often, turning things over to God becomes “hoping for the outcome you desire without working for it” or “assigning God a task like He is your employee”. I hear this a lot in urban gospel music where God is going to pay your light bill or end your money troubles.
It fits with your idea of giving it to God and then picking it up again. You never really let go. If you trust God to pay your light bill and it didn’t get paid, did you really trust Him?