Yes I believe she is missing voluntarily. I have not been officially told that, but I do agree it's probably safe to assume. There is no indication they feel she was abducted.
However, that doesn't mean she is safe.
In MY opinion and not from my talking with TES.....
I believe there is more to the story or TES wouldn't be searching. There is definitely some piece of the puzzle we are missing here.
TES searches for voluntarily missing minors...because they are minors...but not usually voluntarily missing adults when it is obvious they are voluntarily missing. They do not have a lot of resources and there are a lot of people to search for. Unless there is a factor which puts that voluntarily missing adult in some form of danger they generally don't use resources on them.
So until TES stops searching for Candiace, I will believe there is some factor involved which causes them more concern. A physical or mental health issue is the only thing I can really think of.
That is just my opinion however and I could be completely wrong. For all I know TES could simply be involved even though she is a voluntarily missing adult, because it is actually IN Texas and therefor isn't using many resources. I do not know.