Hi Violet
Foreign adoption can be very confusing, and there isn't a lot of information simply because it's not a common route to go down. Most people do domestic adoption, even in the US the same holds true.
The requirements for foreign countries are all different , so she needs to look up the requirements set by the countries. She can do that via US sites as well (though stick to sites like the state department website, not agencies who often have out of date information), because the requirements set by the sending country (eg. Russia) are the same for all prospective parents no matter where they come from. She also needs to have a limit of how much money she could spend - countries really differ in how much it costs. For instance, Russia is usually a very expensive country, others would be cheaper. UK domestic is free.
As a single woman, some countries will not be an option for her. Single woman can only adopt special needs children from China, but there is no special needs UK program open, so China is not an option for her.
When it comes to babies, she needs to be aware that in most countries, she will not get a baby under a year old. Many countries have the young babies on domestic adoption lists for at least 6 months to ensure they have the best chance at a domestic adoption, before they become available for international adoption. Then the length of time before referral and travel is complete, mean that she should expect to get a child between 12-18 months at the youngest. Also, there are some countries which restrict singles from adopting young children, so they go to married couples instead. One thing that is true the world over, is that there are not very many babies who need adoption.
She also needs to be aware that with young children in foreign countries, the medical reports can be very scant on information, or even misleading. Certain countries expect parents to travel knowing very little actual information about the child. She needs to be open to more uncertainty than a UK adoption, where she could expect a lot more information about a child.
The good news is, lots of people have happily adopted internationally, including a single adopter on this board :) (She adopted from Kazakhstan which is closed for adoption now though). It just involves some extra and different considerations than domestic does. Your friend can get information from OASIS here www.adoptionoverseas.org/ or the Internountry Adoption Centre here www.icacentre.org.uk/