I remember the excitement of travelling to see my grandparents and having to get there in time to watch the very first UK television broadcast of the original star wars film.
Having watched 'the original three' so many many times that I know, almost verbatim, what line is coming next, I felt a great disturbance in the force when the 'improvements' were re-released in the remastered and special editions.
Something uniquely special from my childhood was taken out to the back yard and had it's innocent and trusting brains smashed out by a beardy-troll with a large maul.
I didn't so much mind the broader aspect to some of the scenes with no dialogue - these added to the atmosphere of some of the settings and places. But such subtlety should have ended there.
Don't get me started on who fired first, Solo, or Greedo... lol
In the original, solo shooting first lent the character a edge of ruthlessness that made absolute sense, making him more believable and providing contrast with his later decision to help the rebels in the battle with the death star - underneath the smugglers cold exterior was a conscience, revealed by his journey with luke, obiwan and leia:
http://www.youtube.com/watch?v=e1YbFnkZwZk
Greedo shooting first, missing, then being shot in turn by Solo, turns them both into two dimensional good guy/bad guy caricatures:
http://www.youtube.com/watch?v=0qUjsCODGnE
it may as well have been edited to look like this:
http://www.youtube.com/watch?v=M0Asjh-HjRE
Would that that was the only thing george 'enhanced' in the original films
OP, my advice: let her watch the original three, unedited if possible, then see the prequels and 'remasters' in the dim light they so richly deserve.