Legally, no. Practically, she might find it romantic, or her family might be offended if you ask—or if you don’t ask.
@adreamofautumn: a friend of mine is a very liberated woman, who takes no nonsense from anyone. She and her boyfriend (who had been together for 2 or 3 years at that point) discussed the possibility of marriage, and agreed that they would. So she waited, and waited, and waited for him to propose. In the end, he finally did, only after he asked her father for her hand in marriage. She loved it. Her father loved it too (although his response was, basically, ”I have no objections, but you’d better check with her!”)