Should pedestrians have equal responsibility on the sidewalk or roadway to watch for other perils same as watching traffic?

If you are on the sidewalk or road side if a country road, should the person walking be paying attention? I say this because I was forced by the narrowness of the road and traffic to have to use the sidewalk; I prefer not to use the sidewalk and do so only as a last resort, this ”tween” young lady is walking towards me texting away. I get closer, thinking she will look up and commit to one side of the sidewalk or the other; she goes to the inside, I can go to the outside and vice versa. Just as I commit to taking the outside track, she decides to veer that way, never once looking up. If it were not for anticipation, quick reflexes, and good brakes on my bike I would have plowed her into the pavement. Even when I nearly screeched to a stop in front of her she barely broke concentration on her texting. Maybe next time it won’t be my bike but a ladder with someone on it, a hole, shifted concrete do to tree roots, etc. should people play attention to where they are walking especially if they want to be ”wexting” (walking and texting)?