Seeing as she will be busy doing all kinds of fun stuff in South America, I doubt she will have the time or the energy to be calling me every single raid night. That being said, the time difference between us is six hours, which means that if we have a skype called planned, it will most likely trump being on teamspeak.
I cannot say for sure yet how often these calls will be happening, my best guess is every other week or so. If this means I will have to skip a raid night two or three times a month, so be it.
When I am on TS with a raid, I prefer to mostly listen to tactics being explained and joke around with the people I am raiding with. I do of course try to provide feedback if I think I have valuable info, but during an encounter I tend to only call out what is necessary in order to concentrate. I really enjoy the teamspeak during 10-man raids and have had lots of fun in these, while calls with 25 people sometimes tend to be a bit messy
I wouldn't describe myself as shy - I just try to stay quiet around encounters in order for people to be able say what needs to be said.
For me WoW doesn't have an expiration date as I do not plan on moving in with my girlfriend. I must admit that I don't yet know if I will have time for World of Warcraft when I start studying. I will most likely decide in September or October. I plan on playing for at least the first months of Warlords of Draenor though.
I hope this answers your questions