What is needed to charge electronics in Europe?

My daughter is traveling to Germany, Switzerland, Hungary, and Austria next week. She wants to take her Apple iPhone, camera, and I'm sure her hair straightener and dryer. From what I gathered, she will need an electric transformer? Will the transformer take care of everything or do I also need adapters and converters? Apple sales a world travel adapter kit, but is that all one needs to charge the iphone? Or Does one need a transformer? Where can I purchase these items inexpensively? We're not frequent overseas travelers, but I want to protect her belongings and allow her to use them on her trip.

Added (1). I did not see a label on the iPhone. Are they dual wattage?

Added (2). She is going on a student trip. We were told by her chaperones, who have traveled to the area, that she will need adapters/converters/transformers. They are not staying in the regular "tourist" hotels.

Most modern electronic devices like laptops, cameras, cell phones and iPods are designed to work at both the North Amnerican and European electrical standards. You can check the label on the charger/device. If it says something like Input: 100 - 240 Vac, 50/60 Hz, then it will work in either North America or Europe without a voltage converter, but you will need a plug adapter to be able to plug it into the wall. Something like this will do: http://www.cellphoneshop.net/untoeuwaplad.html?CA_6C15C=1525018096. The same one will work in all the countries you mentioned.

The straightener and dryer may or may not work in both places. Again, check the label. If the devices only work at US voiltages/currents, then you need a voltage converter. However, I would recommend just buying a cheap dryer and straightener in Europe on arrival that is designed to work there. The converters are bulky and expensive.

I lived in northern Italy for the last 13 years and never needed more than plug adapters for any of my US purchased devices.

Most hotels lend converters to guests at no charge. Some larger hotels have 110 volt outlets for Americans. Buy nothing until she gets there. Chances are she'll need nothing.