Question/Rant for Musicians

So I sing as a vocalist on our church’s Worship Team. And there’s this lady who’s 10 years older than me, and she loves to bully me because her mom bullies my mom. It’s really annoying.

ANYWAY. There are 3 ladies and one man vocalist on the team, so it’s a bit crowded. But the way we normally do songs is he sings the melody, and the ladies try to figure something else out. The lady I’m talking about has started copying me. Literally, any harmonies I work on at home, she does the EXACT SAME ONE the next time we do the song.

Now this shouldn’t irritate me, but because I work hard on the harmonies I do, because I always write my own harmonies. I leave the easier harmonies for the other girls. And it frustrates me that I work hard on the music every week, and she just copies whatever I do the next time.

The other thing she has started doing is if I’m leading a song with my husband, she starts trying to throw me off vocally by singing the wrong thing right behind me SUPER FREAKING LOUD. She’s done it multiple times too. At first I thought she just didn’t know the songs, but when the other female vocalist started leading songs, she doesn’t sing at all.

When do I say something? Do I say something? She like goes out of her way to treat me bad (including flirting with my husband, but that’s a different story), and I’m already not handling it.

Thanks for letting me rant. I needed it. XD