How can a female student specializing in Sharia respond to some people's mockery and their saying, "Oh, the religious one," so that she is not affected by it?

What you complain of—mockery and harshness in responses when reminding people of Allah—is something even the prophets were not spared. Therefore, you must be patient and seek reward from Allah. Remember the virtue of righteousness during times of widespread corruption, and that your intention is to guide people, not to seek victory for yourself. "Repel evil with that which is best" [Qur’an 41:34]. We advise you to be gentle and kind in your dealings. If you fear being negatively influenced by those you invite to your faith, then distance yourself from them. Be keen on good companionship that strengthens a person and helps them obey Allah.