Cats really do not ignore food, if they are healthy. I wouldn't worry about them in that regard. A sick or very elderly cat, avoiding food is another thing however, and should be attended to. So don't worry about your cats eating at this point.

If they are not fighting or picking on each other, you are lucky.
Many new cats have a hard time with established ones. Make sure you continue to give Pudge affection and attention, so she doesn't feel left out. A simple string game (with an old shoe lace) is always easy, cheap and very much liked by most cats.

Here are two links about cat body language:
http://pets.webmd.com/cats/features/cat-body-language

http://www.cathealth.com/how-and-why/why-cats-head-bump

I think you are doing very well with Misu... we have a friend that took 2 yrs to get her new neutered male from a shelter, used to her other 3 adult cats. One in particular really beat up on the new young male (and she was a spayed female, no less).