The more I think about possible motive, the more questions I have.
It has been reported that Ashlee was in significant debt, and that she was living off welfare income for herself and for Melodee. So it stands to reason that she'd want to keep hold of Melodee even if only for extra financial support.
Melodee was likely killed on the 9th October, and just 5 days later (14th October), Melodee's school district contacted police to report truancy and request a welfare check.
But the timing of that was really just by chance, because by that time, Melodee had not been seen in at least 12 months. The school district only contact police as a last resort, and in the lead up to this, there would have been a string of emails, phone calls and posted letters which Ashlee ignored.
"Parents are not required to report to their school district. However, public school districts are required to verify a child’s exemption from compulsory education by verifying that the private school affidavit filing requirements have been met." (source: - California Education)
Although the sheriff's office said Melodee is homeschooled, a California Department of Education spokesperson said there's no record of Ashlee Buzzard filing an annual private school affidavit, which is a requirement for homeschooling.
"Per state law, the CDE does not assess or physically inspect private or homeschools," the spokesperson said. "Filing an annual affidavit is the only thing that is required." (source: ABC News)
So sure, perhaps Ashlee did fear the eventual involvement of CPS, but
all she had to do to avoid that was sign a single form.
Instead of that, she decided to take Melodee on this elaborate road trip to the desert in the middle of nowhere, and murder her