Just played my first campaign with Rita, and I love playing her.
At first I got to admit I was a little confused about how to actually use her. She's not great at investigating or combat, and her deckbuilding is extremely limited.
What I realized was that her deckbuilding was a tip for how to use her. Rita is built to utilize the underappreciated Survivor trick cards better than anyone else. I loaded her up with lures, snare traps, hiding spots, etc. From there she kind of operates like a Guardian, bopping back and forth, using her evasion and tricks to keep enemies distracted and locked down.
True, there are other investigators who like to run from their problems like Rita, but they usually have better synergy with cards other than the tricks. Rita is probably the only character I'd see myself going all in on Tricks with and it gives her a really unique and fun flavor. Then just round out the rest of her deck with a few weapons or clue-aids depending on what the team needs.