After I grew older, my Mom's mental illness became impossible for me to bear. There was no support at all from anyone other than my father. My mother's own cousin even said to my father not to bring my Mom to their place. This particular aunt keeps complaining about the same thing.
You also may have caused her boss to be seriously concerned about her welfare at home, because this kind of control and interference is a pretty well-known flag for abuse.
You owe her a massive apology, but more importantly you owe her (and future partners, because this is a break-up level offense) some serious soul-searching about boundaries and control.
Someone should had intervened for a 12 little girl. My father was trying his best to get me away to stay with him. On XXXXXXXXXXXX, my Mom's sister let slip she saw my Mom beat me with a cane. My aunt even had the cheek to say that my Mom beat me up because I said I wanted to go live with my father.
The way my aunt said it was like the beatings were wholly my fault. You have a 12 girl being beaten up daily, you are an aunt who knows something is going on and did nothing.
I would never show up at his work and encroach on his business, and if I did I would expect he would address it with me.
Likewise, I would hope that he would never encroach on our personal life, and if he does then I have the right to address him professionally, as it now involves me.
My aunt who lived a few minutes drive away did nothing when my Mom beat me up every day for months until my father managed to cut the red tape to remove me.
My body was full of bruises and I was terrified to go home after school. Not the neighbours who can hear all my mom's shouting at me, nor my aunt, nor my grandparents, nor my school's teachers.
Until today, I do not like anyone who officially practices psychology because those doctors etc... And, when my Mom was home, I would lock my room's door and place a chair against it. My aunt kept repeating to me that on my mother's death anniversary I will have go visit her cemetery.