HELP NEEDED PLEASE!!! Relationship problem!!!?

Hi all, I really appreciate your time. Here's the issue:

Myself and my girlfriend are together for the last 15 months. I am 22 and she is 20. Everything is pretty good. BUT today my girlfriend's best friend Emma rang her and told her that her and her bf had split up and will not be getting back together. It seems as though all of a sudden now Emma wants more of my gf's time compared to when she was with her bf and never made the effort to travel upto Galway to seem my gf( Galway is where me and my gf are both in college). Not that I've a problem about her wanting to spend more time together.

She started saying stuff to my gf like "Oh I was talking to my lecturer and she said to me that I should head out to California for 3 months of the summer and that these are the golden years to enjoy yourself etc...". Emma is keen on the idea of heading to Califronia for the summer(We are all from Ireland). She then said she'd love if my girlfriend would come with her. Then she asked my girlfriend how our relationship was doing? My girlfriend said our relationship was fantastic and that things are going well and even told Emma about a cute thing I did for her recently.

It's just the following that really annoyed me: OUT OF NOWHERE Emma then brought up a big fight that me and my girlfriend had 7 months ago and said "that was a terrible fight wasn't it". A fight that took a while to get past. I thought this was TOTALLY DISRESPECTFUL TO OUR RELATIONSHIP AND VERY INAPPROPRIATE, VERY CHILDISH AND SELFISH. I mean, isn't a best friend supposed to be looking out for the other person's happiness and making them happy???

I'm just wondering what are your opinions on this and what are your opinions of Emma? Why do you think she brought this big fight up in conversation with my girlfriend??? I know why! You'd want to be braindead if you couldn't work it out!!! But my gf doesn't really see it my way and I want to show her all of YOUR neutralist opinions so that maybe she will see CLEARLY then!!! This has really annoyed me and especially the fact that my gf doesn't see it my way! Detailed & genuine responses will be very much appreciated! TOP ANSWER GETS 10 POINTS!!! :)