My son went to two different non-public schools in two different school districts. He did so from 7th grade through 12th grade except for when we were living out of the country.
There seems to be no need for your daughter to do so because she is treated well and is an excellent student in her current setting.
The failure here is the school's not hers. I mentioned non-public school as a demand you could put on them that they might fear if they continue to allow this absolutely ridiculous situation to continue.
COPA