Estranged Best Friend...invite or No?

So, my absolute best friend from college and I haven't been super close in the last 3-4 years. And by this, I mean we lived together in college, she was like my sister and completely inseparable. And now we text maybe 3-4 times a year and aren't really involved in each other's lives. She moved many states away a few years ago and I haven't seen her in person in at least 4 years. My problem is, should I invite her to my wedding? I always pictured her being there, but I feel like if I reach out now and invite her it will be awkward. And her attending may be awkward since we haven't seen each other in several years. But I also feel like if I don't invite her it would be rude because we were so close and I think I truly do want her there on my day. Help!