Is this Allowed as a SPED teacher relating to additional classes being added to my schedule?

I'm posting this for my wife as she was looking for some clarification as her union rep did have any answers for her. My wife typed this below.

She teaches in NYC if that helps.

Is this allowed? I was told this year I will be SETSS provider. My schedule was flexible for the first 2 months with many openings in it (makes sense they would look for ways to fill it up) However, a math teacher was needed for 8th grade and I was assigned that class, on top of SEL classes and another art class for different grades. I have a SPED license in 7-12 and I'm not content specialized in Math. Am I supposed to teach 8th grade math by myself? Also, I only have 1 prep a day instead of the 2 my uft person says I'm supposed to have.

With new schedule no time to make up any sessions with Setss.

Im just looking for feedback to see what to do for my wife.

If anybody can provide any feedback and advice this will be appreciated.