Can I change her mind?

I had sex with one of my friends a few months ago and while it was great, we never really spoke about it and I just continued to hang out with her as a friend.

Recently however I've realised that I actually do like her. We get along really well, we're pretty much best friends and hang out 2 or 3 times a week as well as see eachother at work and all things considering, I'm really into her, my parents love her as well.

I decided I'd try say it on Valentines Day (I know) but she said she doesn't really look at me that way anymore, and because we've been such great friends since we've slept together, she just assumed we were friends and thinks we're better off staying that way.

Is this over, or because we're close and she did like me before am I able to turn this around? I've been told that I can hardly have expected her to like me when I don't flirt with her, touch her or tease her, and that I should try start doing these things again to see if she begins to change her mind.

She said she would try be open minded about things, but also thinks that we're probably better off staying as is. I met her at a course for work yesterday and I began to tease her and make her laugh, she responded by also teasing me and began to mess around by throwing a paper ball at me. I also noticed that when we were standing at the training she leaned onto the counter, she didn't know my hand was there so my hand was pretty much resting on her hip and she didn't move or anything.

Am I being delusional and have to accept I can't change her mind? Or will I be able to change her mind by touching her more, flirting with her and making her laugh?

Can I change her mind?
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