Well, I really have to say: do not trust me - I could be a pimply 13 year old with no knowledge at all 
I studied biology and still work in the field, which means I can read biomedical literature well. Almost 12 years ago, I was stuck at home with my 6 months old who had chicken pox. I had actually just returned to work and was going a bit stir crazy confined at home, so I followed one of my online baby group members to the discussion board she led on ivillage, which was a "vaccine discussion" board. At the time, I didn't even know that there was a vaccine discussion - vaccination had never been a contentious issue in my family. My grandmother had lost most of her eyesight to measles, her brother in law was deaf due to congenital rubella, my uncle had had tuberculosis after the war, one of my teachers had suffered from polio and still wore the leg brace, I myself had coughed my lungs out and lost 8 kilos with pertussis one summer - vaccination was a no brainer. My main problem with vaccines up to that point had been having my daughter in one European country, moving her to the US in the middle of her baby shots (she was 9 months old), catching up with the US schedule while there, and then getting into the European schedule when we moved back to another European country before she entered school. In the mean time, we have moved to the UK, so we have lived in 4 countries/two continents/using 4 different health care systems and following 4 different (albeit similar) vaccination schedules. In addition to that, I have friends with children in Scandinavian countries, so that has given me some insight into their schedule.
So then I started reading on the debate and spent a lot of time on vaccine debate boards. I learned a lot from the literature (original biomedical literature, vaccine schedules, The Vaccine Book by Bob Sears, etc), but also from mothers whose children had real adverse events (ranging from harmless fevers to encephalitis) from vaccines and mothers whose children had complications from vaccine preventable diseases (ranging from high fevers to stroke).
Overall, this has given me a lot of perspective about why which vaccine is recommended when and how often in which country.
So I would claim some knowledge, but I would never ever expect anyone to follow my advice. I am not a medical doctor, I do not know your child, who has her own history and immune issues. I can just provide some general guidance through the jungle (things like how to space the DTaP) and give some pointers which way you could go with your pediatrician (and I realise that sometimes that is difficult, because doctors/systems can be rigid and access to health services completely different when abroad). I cannot give you a proper "second opinion".