An unmarried (with no kids) relative of mine is re-doing their will but her companion is drafting it for her in a web tool. The companion is drafting it in a way that they are the main beneficiary as well as the executor and durable POA. I suspect coercion is taking place.
Do you think that he is pretending to be her companion only to get her money?
I agree with lealonnie1, that if your relative doesn't have any impairment then it's her decision.
If she's only known this companion for a brief time and you now for a fact that she's changing her Will as you described, then I also agree that you need to have some very hard proof to involve APS or an attorney. That's your only recourse.
Good luck to you.