E.E.
It's not really a big deal. I mean, it's not dangerous or anything (nor does it make her any more immune).
And you're not at that doctors office anymore, so I wouldn't worry about that. Mistakes happen, even to doctors.
My son got an expired dose of one vax so had to be re-vaccinated (though I don't remember what at the moment).
However, I think maybe now YOU should be proactive of your children's health. YOU should have a record of when and why your children have seen the doctor.
The doctors office sees hundreds of kids. So, you need to be extra proactive about your two. I always check the vials of vaccines to make sure it's the right one, and it's not expired.