Audio problem: When Gina says to Tiffany, "she wants to roleplay," Tiffany replies, "Uh, no, no, no she doesn't." However, Tiffany's mouth isn't moving for most of the line, revealing it was added in post.
Audio problem: When Lexy apologises to her mum at the dinner table, as she says "All this time during recovery," her lips aren't moving for the first few words.
Answer: They were blamed for the death of Jake's foster brother, which was deemed a terrible accident, and they were sent to the reform school as a punishment. Presumably, when they had to leave the reform school given what happened, they were instead given community service as punishment.
TedStixon