I want to forget about her

I totally get what you're saying and probably had experiences like that a few times. First of all congrats of posting and understanding you have a problem. Don't obsess about her because you're putting her on a pedestal, even if she's really attractive be careful of the fantasy stuff, just like porn addiction if you don't even know this girl that much she's a normal person just like you and me just happens to be the opposite sex.

The one thing I can say when I look back on my past is don't live with regrets. Take chances, you don't want to be looking back on this years from now and say what if and telling yourself she's the girl that got away because it just leads to more self confidence problems. Take the chance, find out more about her. One thing I can say is don't be desperate girls seem to be able to sense it and don't be overly romantic, keep it casual. Ask her to a drink during the daytime that you want to try a new brewery or a bar. You can add something like I found out this bar and you came to mind, idk something like that. All I know is you got to put yourself out there.

 

I read your text and thought about your situation. You have 3 options:

1. I know you won't ask her for a date, but consider this thought too because you'll show braveness with this step. Take the chance if you get one. But if you unsure about it, then go to point 2 or 3. Else:
   Make the first step and ask about a date. The worst case you get is a no, but you cannot say it if you don't try it. In which mood have you been, that she kissed you? Try to get this mood again when you are near to her. In vacation I got some kisses from girls, just because I was in a great mood and appeared as a person, who has no worries and just wanted to have fun. But don't worry, it didn't/doesn't work in my home-country because they suck very badly there. Or do you have worries about her, does she maybe show some negative aspects (on instagram etc.)?
   
2. Act normal to her without showing your feelings - like you mention in B. Ask her about doing something you like /she likes. Wandering, drinking in a pub, climbing a mountain whatever. You'll get your first impressions how is her behaviour, how does she act etc.. Instagram or another social platforms are no platforms for knowing someone or communicating, maybe except she lives far away from you. But if you meet her in RL you'll know her better then on a social platform. It is because social media are great platforms to hide the true identity of the own, so don't believe everything she write on instragram etc..
   
3. Let her go. Don't make suffer yourself that she could be the right one for you or the bad one. Anyway outside there are millions of women, she is not the last one. Don't focus too much on her and make something else instead, for example learning a new language or making some gym.
   In the worst case block her on instagram to avoid her.

And the case of "Forgetting her":
The first crush I had was similar and I couldn't get rid of it - I asked her about a date and she refused me hardly. This made me sad for a whole time. Later after a year I got over it and was later happy, that I DIDN'T get her. She got uncomely because of her nutrition and I heard other bad things about her. It doesn't mean that this could happen in your case with this hot woman but this one was my experience I made.
Another example which is more similar to your case is: At the moment I have a similar situation about my tutor from 1 year ago. Everytime I saw her, I got this feeling in my heart. She looked at me often, but I think she does it because I look similar to my brother (my brother is a fellow student of her in the master studies). We said hello to each other when we saw us somewhere in the university - nothing else happens, one time I talked with her about doing a semester on a university in a different country. And I cannot say anything about her because I know her just as my one-time tutor. I decided to avoid her because I wanted to focus on my studies. But now I realize that I repent it that I didn't even tried to make her a compliment or ask her about to do something (visiting a concert, playing escape-room, making a LAN-party or something else).
You can see on the last one that it can have cons, if you don't get the chance.

 

When ever thought came about her in your mind say "BLOCK" after few days you will no longer want her. It's work try it