The best way I know to tell you to help get your emotions/reactions under control is to stop taking everything she does as personal. Remove yourself from the equation. You wouldn't react in a hostile or controlling manner to someone who has cancer and is not relating to the world around them appropriately. This really isn't any different.

She is not well at the moment and she is basing all of her decisions on what she thinks is best and safest from her perspective. It makes no difference whether all of us and everyone around her thinks every single decision is completely wrong/immoral/dumb/ whatever. They're her decisions, and all that matter to her at the moment and every single one is the RIGHT one as far as she's concerned.
Start to grasp that and your reactions towards will start to change.

Me 47 - W 35
M 9 - T 10
2 Daughters - 7 & 9
Discovery of EA- 8/4/14
S - 8/5/15
D mentioned - 9/11/14
R & Piecing - 3/17/15
Regard one another as more important than yourselves.
- Philippians 2:3