Oh ok. I thought you'd had her only a few months. I must've misread something. But any which way, just be patient with her. I'm confident she'll come around. I honestly think going into the enclosure less often will help.
Going in with confidence goes a long way too. If you're displaying any signs of nervousness the snake can pick up on that and become nervous as a result.
And yeah, the water thing only applies if your water is unsafe for your consumption as well. Safe for you = safe for your snakes.
This is why I feel it's so important to cross reference information and learn from reliable sources. The internet is a fantastic learning too, but also a breeding ground for false information. So pick and choose who you learn from carefully.