Ideas from another post I recently wrote:
I suggest that she set up protection every time she meditates. One way to do that is for her to strongly state, either out loud or in her mind, that only energies that work toward her highest good are permitted to contact her, enter her home, or influence her in her meditation. Another way is to visualize herself surrounded by beings of bright light and love, beings who protect her and work toward her highest good. Imagining a bubble or circle of white light works, too. (If I use the bubble, it travels with me, though.) The details matter less than the intent behind them. She should find a method that appeals to her and use it consistently.