Just keep handling her bud,and if she does want to bite then let her bite your knuckle and force it into the mouth(not too hard or you may do damage)but the Jill will gag,then let her go immediately and offer her the knuckle again,if she bites again then redo it,but most learn very quickly.It will hurt by the way,but,it will also sort the problem,just be very careful not to hurt the Jill mate.
M