Tape??? No...pull all that up, please!
Flour on the floors can show the tracks of nighttime travel.
In the evening, try sitting VERY quietly in a dimly lit room...whichever room might give you the best listening spot for the most square footage of the home. Just sit quietly and read a book or something. And LISTEN. Also, beforehand, you can scatter plastic grocery bags...push 'em behind/under furniture....anyplace you think might have snake traffic. And then just LISTEN for her to make some noise.
If you have any warm-blooded critters in the home, you can pay attention to them, they will often alert you to the snake's hiding place.
Don't dismiss cooler areas for hiding...don't dismiss tiny openings or tight squeezes...and don't dismiss height. Ball pythons have been found crammed up behind the toilet, between the tank and the wall....definitely not a warm spot, but must have seemed secure enough to the snake! LOL They've been found behind dresser drawers. They've been found on ceiling rafters and tops of book shelves. They can squeeze themselves through and into astonishingly tight spaces.
Don't give up!!
EDIT to clarify a thought: Sitting quietly does not just have to happen in the evening...that's just the most likely time of snake activity. But ANYtime you're at home and can be quiet to listen...do so!