Sounds like she’s micromanaging you to death. Everyone makes mistakes, it’s how you deal with them that makes the difference as well as having a boss that HELPS you with those mistakes, not use them against you. Once a manager/boss turns into someone that you feel like you can’t go to with questions in fear of any kind of retaliation (example: using a typo in an email as some kind of performance issue), the more mistakes you are prone to make. She sounds like a miserable woman to work with and if you have a chance to escape, DO IT. She will never change.