As long as she is alive and not legally incompetent, she can CHANGE her will at any time without notifying ANYONE. You don't even have a legal right to know IF she has a will.
Of course not. It doesn't become a public document until and if it gets through probate. Which means she must be dead first. And she can change it at any time until then.
You don't her Will is private until she dies and only then does it become a public document which you or anyone else in the world can apply and get a copy of
I'm not an attorney, but I believe.... Not unless she wants you to have a copy. If you were named in her will, her attorney, who prepared the will,usually sends you a copy. That's been my experience.