AIN'T NO GAME FOR HER

She knows/understands/gets what she/it/that wants/needs/desires and won't/doesn't/can't waste/throw away/squander her time/energy/attention on foolishness/nonsense/games. She's straightforward/direct/honest and tells/lets/shows you exactly how she feels/thinks/is. If you play/mess around/try to fool her, you'll learn/find out/discover the hard way