Maybe she's just a very sociable person. But I agree with Serendipity...better if she hangs out with female cyberpals. If she's considerate of her loved one's feelings, she won't press on,with this guy, out of consideration for your feelings. Because she cares about you, not because you're a man, and can pull that lame "headship" card out if all else fails to get your way! That said, if I were her, I'd have a REAL problem with a man using that headship bs on me! I certainly would not marry him!
I see possible incompatibility surfacing. She wants to be a free spirit with many friends, and you want to control her. You'll both have to compromise, or one will have to change a lot and find themself very unhappy later on.