Sounds like you are someone who are easily triggered. Or someone who not used to work in harsh and dynamic environments.

Anyhow, the way i see it is, the manager is not questioning you. More like she know nothing about those jobs, hence asking many question to learn how to do it.

The presence of new joiner serves as 2 purposes:
- as an excuse that she is getting the new joiner to learn in case u ask her why she did that
- and a lesson for the new joiner so in future he/she can do such jobs without troubleing her.

Main point: your manager know nuts