Nigga... READ the article before you come quoting shit. It lays it out in the first goddamned paragraph of her history:
"The character debuted in Marvel Super-Heroes #13 (March 1968) by writer Roy Thomas and artist Gene Colan. In the story, she is an officer in the United States Air Force and Security Chief of a restricted military base, where Danvers meets Dr. Walter Lawson, the human alias of alien Kree hero Captain Marvel.[5] In a later story, Danvers is caught in the explosion of a Kree device after trying to get close to Captain Marvel.[6]"
The bolded means there was a Captain Marvel BEFORE her. Her history is laid out right there in front of you and you're either too stupid to read it, or too braindead to comprehend the words you ARE reading.
How was she "Captain Marvel" in '77 when Mar-Vell didn't die until '82? It even says her first name was Ms Marvel.
When did she have a chance to take the name when Monica was introduced as the new Captain Marvel only months after Mar-Vell died?
It couldn't have happened before Genis-Vell took the name because for a time both he AND Monica was using it, ending with her giving up the name because it was pretty much his birthright even though he said she was more worthy of the name than he was.
You're either as dense as a black hole or trolling at this point.