I'm nineteen weeks pregnant and had the flu vax in the first trimester. Two weeks ago DD, DH and I got influenza A (confirmed through swab). It was seriously nasty and went straight to my chest. The doctor wanted to give me Tamiflu, which I declined, but wow, I've never been sicker with the flu. DH was also vaccinated- he ended up with pneumonia.
I tend to agree that if your daughter has it now, you've already been exposed to the virus, and the horse may have bolted.... It's a hard decision to make, and there are no guarantees with vaccination- hope you beat the bug!!