Well, I'll throw this in about flu vaccines. My mom has gotten the flu shot every year since I can remember and every single year, she catches the flu--not just a little discomfort either, she would be out of work for a full week or more. She's a really healthy person otherwise, nothing comprising her immune system or anything. However, my parents never gave me the flu vaccine when I was little for whatever reason and I've gotten the flu three times that I can remember (ages 9, 15, and 21). So, for obvious reasons, I never saw the point of having it. I got it this year because I intern at a hospital and they run around like everyone who doesn't get it is bound to die a painful, miserable death.
It was just for this year and, as I had a reaction to the shot, I don't plan on doing it again, unless I once again find myself working in a hospital or some other place with immonosuppressed people. And even then, it'd be for them and not me.
That being said, if a baby falls into that high-risk group, then the pros may outweigh the cons. You're her mom, so you get to make that call. As she gets older, it may not be so important, but right now she's your baby and you're protecting her the best you can. You're right not to let threats of antifreeze scare you.
