bio mom from hell ... i hate my step kids mother!

She is an absolute disgrace. 30 years old, never employed, didnt finish high school, no car or license, lives off her parents who repeatedly kick her out, lost custody of her other son. She wants my step kids to go back to their old school next year (same school that failed to pick up my step sons learning disability) just so she can walk to th3 school to pick them up (convenient). She wants it to go from 5 on 5 off which is what we have been doing and it works well for my work, my partners roster and is 50/50 ... she wants it 7 on 7 off which will mean 2 days a week i will need to get my own kids to school, her kids to another school and ill be 7 months pregnant trying to juggle all that when the way it is now theyre all at the same school, a school which is supporting step son and his learning issues. She doesnt pay for uniforms we do, she didnt turn up to parent teacher interviews we do, she didnt pay for camp ($400) we did and she has the audacity to ask us to change the way it is to convenience HER? I HATE THIS BITCH