North central TX is a broad brush. Silver Leaf maple is native to eastern canada. Why people plant it in TX is lost to me.
I will wail on that pt another day.
Probably a combination of these 100+ days and basic soils.
I would try water and mulching under the tree. Hopefully you got some of the soaking rain the last few days. Sure was welcome here after the 110 last week.
Where north central?
Here in Austin I recommend cutting out all of that exercise and planting a proper tree for the site. Silver Maples are short lived here. If it doesn't die this year, it will....soon. That is just me. I tend to operate with the philosophy that trees should be a legacy for future generations to enjoy, not a liability for one's retirement nest egg.
When I look at trees on a property, I see assets that will contribute value or liabilities that are going to cost this property $$ in the near future.