Not necessarily a bad idea as long as there is a mutual response from her. Sometimes, she might be liking you but she did not show any signs of liking towards you. Girls can be that complicated. Give her a time or a space after you have done flirting with her. But just make sure your flirting is convincing enough to make her believe that you only want to be with her. Girls can have a strict sense of belongings once she is with the guy she likes. You engage with her or you dump her, just make sure you are prepared for the worst since you are the one who flirts with her in the first place.