Nothing like a cute kitten photo to look at. She's lovely and very similar to one of mine at the same age. Don't forget one of Polly when possible!
If you've already got cat beds, see if they use them. Otherwise I wouldn't bother - they'll find areas of their own - your settee, chair, mat by front door or cat flap, top of a box, corner of bedroom, bathroom mat etc etc.
It's a good idea to have a water bowl away from their food, apparently they don't like the two together. I didn't really take this on board with my last two, but I have two bowls for my present two. One is in same room as cat food, but it's the other they use most often.
Play wise, small soft balls, even ping pong balls go down well. As they grow older, one of them might like a kick-a-roo occasionally. If you get a delivery in a cat sized box, don't forget to leave it out for a few hours so they can have fun investigating.
My first two were young like yours and happily stayed in their room. My present two were 15 weeks, managed to blackmail them into room at night with food but once let out in the morning, they were like bombs - a nightmare at the time, but happy memories now.
Obviously as they and your DD grow up, teach her to let them have their own space and the fact there are times when they need to be left alone. My DD pushed her luck more than once, which resulted in a swipe - but she never did it again.
Best tip of all - love and enjoy.