I partially agree with Venom above. I think specifically targeting a body part, in this case her feet (especially the feet because of the well known foot fetish), draws a lot of negative attention and sends a negative vibe. I think it probably would have been slightly less weird if you just asked if she was ticklish instead of asking about a specific spot. Usually asking about feet automatically sends the wrong message to most people unless it's related to the video at hand.
But at the same time, you asked and it was a brave/bold move, so I'm not really gonna bust your balls for it. Good job. Shame her answer was less than satisfactory. She could be ticklish in other spots but I guess we'll never know. Or at least not for a while.