So you worship a female deity you call “Mother Nature.”
No.
"How can she be known?"
If you don't know the answer to that, you must be too much a city person. Get out into the country for a bit.
"Served?"
Serve Mother Nature? Her ants can have the leftovers from my picnics.
"What is her character?"
The difference between a jungle, and a rainforest is this: When you're flying over it in a small plane, you can look down and admire the rainforest.
When your plane goes down into it, it becomes a jungle. You will be eaten. That is the character of Mother Nature. Keep your plane in good repair.
"What exactly is her will?"
That's a good one. I'd say her will is curiosity, with a nasty disposition.
"Does she provide a transcendent ground for ethics?"
Only by negative example.
From your first paragraph, I take it you’re not up to a two-way conversation that seriously engages your public words. So, adieu.