G'day there! Interesting character you've got here, though with no real listed reason to be on Orion. Not a problem though, we're here to help.
Orion's purpose is to monitor and contain interdimensional rifts, and to protect the planet's inhabitants from whatever may come through. It also houses anything that does come through, if, of course, they're not hostile - this is how many of the abnormal characters get on Orion. Joining Orion - IC, of course - is not to difficult, it has been stated that they run recruiting ops in many major towns. However, you do not need to join Orion for the purpose of fighting interdimensional rifts, we've got many characters who want nothing to do with that whatsoever. Perhaps Ella wished to travel there, it being a place she never even knew existed - much like a character of mine, Gallie Vant. Or, perhaps, she wanted to see what kind of science they had, maybe if they can fix her eyes?
As for how frequent, well, we're all over the place. We have a Skype group that's used to setup interactions - it's not strictly required, but it's very, very difficult (and rather luck-based) to get an interaction without it. I'm pretty sure I still have you on Skype, you can message me and let me know if you want to be added. Sometimes we're fast, sometimes we're slow, usually we're slow, and sometimes we're very slow. Most of the time, Orion is a sort of slice-of-life-on-a-space-station roleplay, but if that's not your thing, you can wait for someone to do something a bit more structured and storylike. Or, you can do something yourself!