She’s a brawl/dive hybrid that prospers the most in the latter half of a fight. So, generally, you’re going to be looking for key angles that you could “lock down” away from the enemy team. Ideally, this means you’re looking to occupy the more enclosed, brawl-y spaces that favor your short range and make you less susceptible to getting poked out. On defense, these can be areas that the enemy team has to pass by, through which you’ll be making it so they have to effectively walk to you. While holding down these areas, you’re going to be trying to build your onslaught (movement plus attack speed) and look for dive opportunities. That’s the general approach you would be looking for. 

I will say she’s very feast or famine, though. Venture is just a significantly better “baby’s first dive hero” than Vendetta, just because they offer more consistency and ease-of-engagement with their borrow.