Raffia is this kind of grassish thing, isn't it?
Maybe I'm wrong.
We were supposed to know what it was in art class. But I forget now. We studied that too long ago lol.
Yeah the wobble techinque works really well.
And after she gets the point and stops biting, I'd advise you to keep going with whatever you are saying. Like say "No" firmly eveyrtime and after her biting decreases, don't wobble just say "No."
Then if she later does something else you don't like you can say "No" and she would probably get it.