Two days is not that long. Figure 10-12 hours of being upset (upset you left, upset you fought, upset in general, whatever--we don't always need a firm reason to feel upset), 8 or so hours of sleep, and sometime in this timeline you called her, if I understood that right. Figuring another 8 hours to sleep, you've given her one day or less to hang out with her friends and/or think about the fight. I think the reason it seems like so long for you is because you're still all emotionally worked up.
Relax. You need to get it out, fine. That's a good thing. Trust me, us women don't like guys who bottle up emotions! But you don't really need to go into with her
right this moment, you've just got to get it out. Write her a letter. Or better, write yourself one. Talk to yourself about the whole thing, decide what you want and what you want to tell her, and
then write her that letter. Get her some flowers for the next time you see her and attach the letter. If you're picking her up at the airport, leave the flowers on the counter or table or on the bed--don't hit her with it as soon as you see her again!
If you absolutely have to contact her before she gets back--you didn't say how long she'd be away--than make it something sweet and light-hearted. Send flowers to the hotel, or something like that. Write her a poem--sweetly romantic or even silly, but no angst!--and mail it to her in a romantic card. But she's on
VACATION--give her a break! Let her relax, too! Put all the problems on the backburner while you both air out. I'm not saying to supress your emotions or anything like that, and I'm not saying to not discuss it with her
ever. I'm just saying don't hit her with it when she's trying to relax.