Resolved questions
"I can't get her off my mind." and "I can't get her out off my mind." They're the same?

Almost! But write the second sentence this way: "I can't get her out of my mind." Write "out of" not "out off." Okay! And yes, they mean the same thing.

For me, they sound the same if the two sentences will go this way:
< I can't get her off my mind"
< I can't get her out of my mind"

Note: It is being redundant to use " out" followed by " off".

I have heard "get her off my mind" occasionally, but you will more often hear "get her out of my mind."

On the other hand, when some source of worry has been removed, the phrase you will hear will be "That's a load off my mind." - or, less often "That's a weight off my mind." If it is somebody that you are dealing with, you would "get them out of" your mind.

I can't get her off my mind." and "I can't get her out off my mind." They're the same?
my answer sir is they are the same but the words off and out are not the same. and it's being redundant also...