There's no reason to cut back bottles if she isn't keen on solids enough to take over the nutrition lost from cutting out a bottle.
What solids is she eating and when? Could be a routine issue and she's either too hungry or not hungry enough to sit in the highchair for long. Also may be she is not interested in what is being offered and could want to broaden her horizons?? Or if she is being fed, perhaps she wants to feed herself?? Or vice versa. Maybe we could up her interest in the solids by taking a look?