I never use vent unless I need to. Seriously, why are people so surprised to hear a girl raiding?
Depends on your side,Server, and age of your guildies.
If your Alliance then they shouldn't be too surprise.Alliance has more casual players and more people with lives.
Horde on the other hand is horrible when it comes to girls.When I played an undead rogue a guildy of mine was a girl and talked for the first time.She kept getting bugged over the next 3 hours.
"Is this really you?"
"Are you hot?"
"Will you go out with me"
"A/S/L u cyber?"
She left after a week of that.