ginny waited five years for harry to come round, so i don't think she'll just give up all of a sudden and just sort of go, 'fine then i'll leave you to it, have fun destroying voldemort's soul' and wave him goodbye.
also remember her reaction when he tried to tell her she was too young to go to the ministry with them, she nearly bit his head off. i have faith that ginny will react the same way again, she won't tolerate being pushed to the side to be 'protected'. cos she's the youngest and a girl, in her family, even her brothers are overly protective of her. and it drives her mad i'm sure. so god help harry if he trys to do it to her. she may have to put up with it from her brothers, cos family are family and you can't change them. but her boyfriend? she'll go for the jugular and harry won't know what hit him.
that will be funny to read, i love ginny's temper