You cannot control the internet and the way your picture
or footage is used or abused and so 'ell no, I would not
want any of my friends or family being exposed to the world
in this way. Youtube is full of pictures of people who
unwittingly participated in live action camera stuff and
there is no stopping it even if you wanted to.
Now, if you were having a seminar and it was in a small
controlled setting, and she had the panache to allow you
to demonstrate on her, that may be appropriate but just as
you may not want to demonstrate how you can dance around
and swing this or that this direction or that, at her request,
it should only be something done by willing participants
and dat be dat...