In the context of the image, it wouldn't be a problem if someone of us have asked her if it was ticklish for her. But, looking at the image, it seems to has been an Instagram story. If it was a picture, it'd be easy to ask...
Anyway, I think it's more likely to have been a tickle than not. Not much more, like 55% - 45%. But, yeah and of course I want to believe it was. Judging by her face, as Jeff has already stated, makes me think she was ticklish...