I doubt any of them would deny they are Colombian entirely, but they certainly wouldn't accept her as just like them without considerable prodding and evidence. Her name would probably put in much of the legwork (as would her lack of accent to them), while her appearance would work against her.

To use a much more American example I have personal experience with. Light skinnedness in both black and feather indian tribes can often be a source of derision. Sometimes its just teasing, others it can be outright exclusion. My childhood buddy's mom used to tan her skin to leather daily just to avoid it when accompanying her husband into the tribal activity (her natural color was ghost white), because they would harass them both for it and even attack the children as being "not real Houma" and various other halfbreed insults.

Of course its not a guarantee. But the point being that its really only white people (and mostly white americans at that) that don't have numerous and often strict hierarchies based on skin color within their own group. Each of those three people from Mexico you listed likely has strong opinions about who is actually the real Mexican.