Velandra can really make her presence known whenever she shows up. She can either be your best friend, or your worst enemy, depending on what she sees you as.
If you are honest and sincere with her, she will be a valuable teammate. But the very instant she sees someone doing something sneaky or dishonest... or doing something mean to her like make fun of her weight... she will DEFINITELY call that person out. In other words, DON'T get on her bad side.
This strategy is probably not the best strategy in the world for a series such as this, but rumor has it that someone has won a similar series using this... TWICE, in fact... "as long as it wasn't her".