The only reason that Lisa's parents wanted to send her to Wentworth is because they love her and they were concerned about her priorities. They were doing what they thought was best for their oldest daughter.
In real life Max and Mrs. Reg would have agreed with Mrs. Atwood's decision to send Lisa to Wentworth. Max and Mrs. Reg would have sat down with Lisa and explained that sometimes it's better to move on.
When Mrs. Atwood and Melanie arrive at Pine Hollow to take Lisa home and force her to go to Wentworth a stunt double can be seen jumping on Patch. The close up shots show Lara Jean Marshall. The scene then shifts back to the stunt double.
If Lisa had made her model of Mt. Everest at home without help from Carole and Stevie to go with her poster that would have been enough to not only improve her project, but she would have brought up her grades and her model of Mt. Everest wouldn't have burned.