OP, I get it. I'm very close to my dd (my only dc) and she is my favourite person in the world. I really look forward to seeing her and spending time with her. And I would like to think that she looks forward to seeing me too. So I would certainly be disappointed if I found out that she wasn't coming home when I had been expecting her.
But I think you have to try and reframe this in your head. Don't see it as sad that she isn't a home body or that she has chosen to go to uni far away from home. Celebrate the fact that you have successfully raised a confident and self sufficient young woman who knows that there is a big world out there to explore. The fact that she isn't rushing home at the first opportunity isn't a sign that she doesn't like home, or that she doesn't care about spending time with you. It's just a reflection of the fact that she feels secure enough to try something new. And that's wonderful.
It's entirely natural and healthy for young people to branch out and start living their own lives, and yes, as parents we might feel a little sadness for the fact that they are building lives in which we will never be as central to them as they are to us. But that is exactly as it should be and I don't suppose that we would really want it any other way. Would you really want your dd to limit her world to keep you happy? I certainly wouldn't want that for mine.
I ended up living on the other side of the world in my late teens and again in my twenties. I often think now about how hard that must have been for my mum, but I don't think it really occurred to me at that time to think about how much she might miss me. I wasn't trying to get away from my parents in any way, I loved being at home and I adored them. I was simply excited about the opportunities in front of me and being able to explore them. Knowing that I had a secure base which I could always call home gave me the courage and the confidence to explore the world. I will be forever grateful for the fact that my parents always seemed happy and excited for me, and never let on that they were sad.
Now, my dd is an adult and she too is exploring. I miss her a lot, but I couldn't be happier for her. I invested so much of myself in raising her. I want her to have all of the adventures in the world. And if that means that I see her a little less often, then so be it. The love between us is still as strong as ever even when we're far apart. And communications are a whole lot easier these days too!