At this point, it seems the decision has been made not to get the flu shot. She mentions it occasionally, so sometimes when we are out I will say, "If you want to get a flu shot, now would be a good time". Yet somehow she never wanted to at the right times. I think she got the idea from friends at school, as well as the fact that she had the flu last year and doesn't want to be sick again. But it isn't something she seems to have strong feelings about.
I brought it up at dinner last night and told her if she really wants to get a flu shot, it needs to be very soon since we are already in flu season. I also told her that there are other ways of protecting ourselves from getting the flu, like frequent hand washing, avoiding people who are sick, and taking vitamins with echinacea (she has taken a children's form before). Also, there are several strains of flu but the shot only protects against one, so we can't guarantee that we won't get the flu even with the shot. She said, "okay" and seemed happy with that.
If she does get the flu again this year, I'm sure it would influence her perspective again. I can still explain that we make the best choices we can with the information we have, and we still don't know for sure that a vaccine would have prevented it. If she has stronger feelings about it next year, it may be best to go ahead and let her have the flu shot then.