Tricky stuff! I know what you mean about the periods of history - they are quite keen on more recent stuff these days... however suspect it would be useful to do history at some point, remember you can do A level history without GCSE so that may be an option.
Re EPR or Geog - really comes down to which she enjoys doing - sometimes it just comes down to the teachers
Geog may be useful for Archaeol but TBH Unis are just looking for a broad range of subjects and it looks like she will have that whatever you choose
PS have you discovered thestudentroom forum ... definitely the next stop in the journey and plenty of parents posting along wit students trying to get their heads round UCAS GCSEs A levels etc etc