I feel u ise

Document and tell the professor, u do your part and have the professor base it on your evaluation also record your communication with her team and send it to your professor. If u do everything by yourself ask your teacher for extra credit

Noted down thank u

Yw, never let people take advantage of your work ethic and take what's rightfully yours, your not responsible for other people only for your self

Also, if no one else did anything, just put your name down as the only contributor.