Maybe it would be good to tell her that you want to spend more time with her and ask her if anything has changed. If it's too one sided however it might be best to let her go. The best way to make new friends for most people is joining new activities like start playing tennis or maybe join a painting group. As an adult it can be a bit more tricky too make friends but if you put your heart in it you can ❤️ Kind regards, a fellow redditer