Lilith is ticklish pretty much everywhere, except for her feet. I test various spots including her: ribs, sides, belly, thighs, knees, armpits, shoulders, neck, ears, wrists, hands, butt, hips, and back. I attempt her feet a few times to see what happens.
Not only is your laugh and smile enjoyable, but she tends to writhe herself into interesting poses. You can tell which areas surprise her the most. I utilize a feather, paint brushes, scalp massager, and zerbits along the way. Mostly fingers are utilized her.