It's possible that the yeast infection that your DD got was not as a result of the injection as such, but that her immune system was compromised by the vacc and it allowed a yeast infection to form. You don't have to get her the vacc if you don't want to - simply explain your concerns and get a conscientious objection form, or you can pre-empt any yeast infection by making sure she eats lots of pro-biotic rich food (like vaalia or jalna yoghurt or even giving her a probiotic) before and after the vacc to make sure that she is has optimum gut health.