It is in Tikki's genes to hunt, but you already know that. If she was out in the wild, she would be an accomplished hunter if ample prey were available. If I told you that letting a cat kill a mouse is wrong, I would he a hypocrite, my ferals are also accomplished hunters and our hay barn is full of mice that they hunt down and kill. They don't torment them, they just go right in and take care of the mice, and I feel badly but we can't have mice in our hay. But, if I had an inside cat, there would be no way I would introduce blood prey to it. Sometimes, when a cat tastes blood for the first time, it can change the behaviour, and Tikki appears (in the pictures) anyway that this cat is quite mellow.
Sometimes we forget that animals live in a world of their own, and we project what we think they need, when in actuality, they are fine the way they are and it is our guilt that is supplying that train of thought. Does that make sense to you? I have a dear friend who saves tigers, and other exotic cats and she has never given them any live prey, always just raw meat, and the caracos (I spelled that wrong) she gives raw chicken to them. Tikki has adapted quite nicely to the life you have provided. If you want to stimulate her, bring in a nice solid fish tank and make sure the top is secure and fill it with fish, but as Tikki grows, that tank may tip over.
You have decided to take a cat that should be in the wild or at least outdoors and put her inside. And, there is nothing wrong with that, our neighbor down the road has a puma she keeps only inside. But try not to stir up her innate sense of being a huntress or you might be surprised at the results. This is just my opinion and not a lecture.