Shanti, no I don't think she's weaning. Don't offer her bottles if you're worried about that.
Great advice from gigi! I hope you can find a way to get through this. DS went through a biting phase at this age and I honestly got to the stage where I didn't want to feed him anymore (or worried that I just couldn't). I never offered him an alternative, just stopped feeding him for half a day at a time cause I just couldn't face it. After the last time he just stopped.
Sorry I can't be of more help to you