I am a women with a stutter and i have a boyfriend but i still situationally stutter. But i made sure to bring it up to him before we started dating , but he has always made me feel like there’s nothing wrong with me which has made me super confident. Just be a good support system and im sure that she will become more comfortable & confident down the line. Sometimes tips and tricks can work but having a stutter is a lot more than that and it’s often something that won’t go away