if she is from an agency i'd contact them to let them know the skippy. her first and only concern is you. i'd print out what you posted for a list of concerns and add any you left out to the list.
i'd suggest you speak with her first with your mom present but the situation i believe has gone beyond repair, justme tho, and if the prob needs addressing that's why she has a superior.
OR
u can speak with her first and hope for the best.
i had help for a family member and never thankfully had this problem. she still stays in touch altho i dont caretake anymore. a delightful, professional person.
when my mom was terminally ill i also contacted an agency. then til i found the 3-8 hr. shifts- i felt were doing their job i requested a change. i was younger and less experienced then but i am so glad i did what i did. my mom deserved good care.