The best advice I can share is to just be your lovely self. Try not to focus on her. You are workmates and that is all. It is nice to have work colleagues that are friendly and courteous. It makes the days go by much faster and work, of course, is more pleasant when everyone is getting along.

I have found, though, there will always be people that are unpleasant to be around. All sorts of personalities. Some pretty unsavory. But try to remind yourself it is all about them and their insecurities. It has nothing to do with you. Continue to be generous, kind, professional and just you. That is enough. If she has an issue that is her responsibility to work through.

That said, if she bullies you, is outright hostile, makes things uncomfortable for you or creates a situation that causes tension, if you feel comfortable speaking with her one on one it is worth a try. If she behaves unethically or illegally, document, and speak with speak with hr. Let them handle it. Remember it is their job to manage these things, including risk management.

Otherwise, just try to kill her with kindness.

Everywhere we go in life, whether it be work, family, social situations, etc, there will always be party poopers, difficult people and outright a-holes. It is their problem...not ours to fix. Or worry about. Not everyone will like us. She could be jealous. Remember that is her problem.

Best wishes to you at your summer job! Have fun

if you can, also, bring things to your work station that make you feel good! I like to have fresh flowers every week. Just a small bouquet. My favorite pen and of course my red edit pencils! Also a few pics that make you smile. I also don't don't eat sweets, but I have a little silver candy bowl with some treats for my colleagues to enjoy