Pay attention to her and send her gifts, show her that you are investing time and resources into her. Text her often and never forget to compliment her on everything.
If a Leo is interested in you, they'll constantly compliment you and will buy you things. They also tend to brag a lot to their crushes. They love to flirt,...
It really depends on the individual. Many Leos act this way (bossy, over-confident, etc.), but other Leos don't. The Leos you know could have rising signs that influence them more...