A.V.
You talk to the pediatrician about the risks of waiting vs getting them sooner. Your pediatrician should also talk to your husband so you all make an informed, collective choice.
If you are terrified of the thought that she would get sick, then you consider that a con to waiting. You can ask the pediatrician to space the vax out (though MMR isn't available that way) or to give her just one shot at a time, to weigh the reaction. Your DH should remember that his DD is not himself and she may be perfectly fine. My DD actually got the MMR 3 times due to the timing of the first shot. She got an extra booster just before K.