The educational system in the US is bad. Some states are worse than others. There is a shortage of teachers and high turnover. It’s gotten worse due to Covid. It’s not surprising reading what you have shared. Entry level teaching jobs don’t pay much sadly so it’s not surprising that there is a lack of professional structure.

Teachers are underpaid so it’s not surprising there is a problem with places being short handed. Maybe the director doesn’t say anything about being interrupted because she doesn’t want to lose whatever staff she has.

It’s very possible that you will be disappointed going forward in your pursuit to become part of this very broken system made much worse due to Covid. Perhaps lowering your expectations will reduce the shock in what you encounter.