I get blowing people up in your head to be fantatic, but you have to remember:
She is just a person, like you.
She has loads of flaws and unflattering characteristics, like you.
She would probably react negatively if she knew about somebody idolizing her like this because it sounds like obsession, and the grim truth is that obsessions tend to ignore a person's agency and is disrespectful to them as a human being rather than an object of desire.
She is flawed bud. If you get along cool, but nobody is as perfect as the brain likes to trick you into thinking.
Being unable to approach somebody to learn about them is antithetical to disarming that circular obsession pattern. My advice would be to treat her the same as somebody you could approach and are not nervous around - be that a friend or family member. It is important to keep a person's humanity in mind above petty characteristics they did not choose - such as gender or if they are attractive to you.
Not seeing them anymore is too bad, but it also probably means that any social relationship probably isn't meant to be right now. So in that case take what I say into the future.