Ha, yes she is. She probably weighs about twice as much as she should. Dry food is usually the only thing I give them. I used to give them canned/pouch food every Saturday until the wheat gluten or whatever, I'm sure it's fine now but you never know.
I've been giving equal attention, that's the thing. Maybe Storm just doesn't like Pandora, or Panda, as I should call her for short. She looks like a panda, as in weight. Color wise she's a tiger kitty, a tabby.
Wow. That's a big kitty! Is she very overweight? The trick with dealing with an overweight cat with slim buddies is not getting big girl on a diet, but making sure the others don't drop to much weight. I generally shift to a diet dry and sneak the slim kitties more normal food in another room for one or two meals a day. (This is how we dealt with me mum's dieting as kids, btw. She'd have us all eating diet stuff so we'd sneak chips and cakes into the house and hide them wherever we could. :) )
Otherwise...the only thing I can suggest is do "equal attention". Whenever you pet/handle Pandora, make sure you give equal attention to storm. If it's jealousy, it should help.
Yeah, they're both females. They actually are around the same age, Storm is four and Pandora is two. Pandora is less active then Storm, which I think is pretty odd, although it could be due to her weight, Pandora weighs about 23 pounds, Storm is the same size and weighs about 14. I'm trying to get her on a diet and getting her interested in activities. I don't understand how a cat can become overweight though, isn't that kind of abuse?
There can be any manner of reasons as to why Storm is acting this way. Storm is a female, is the new cat a male/female? Like NewLeaf said, it takes some time for a cat to accept another, some cats have no problem when additional cats are added to the household but some cats absolutely do not like it. Also, sometimes older cats do not like younger kittens because of behavioral differences such as the younger being more active and the older being more situated and calm. Also, your mother could be right because Storm may feel she is being replaced. Just give her time and let them sort it out together. If you see some really violent behavior going on such as fighting, separate them but if it's just some hissing and growling and they don't start fighting and causing injury to one another, let them sort it out between themselves. The younger cat will learn to stay away from the older and they'll have to make things work out between each other.
I hope so, it has improved to some extent, before Storm wouldn't let me come near her, or she would literally attack me. My mom told me that it's because Storm feels she is being replaced.
With some cats accepting a new cat in the house can take some time. Generally they sort it out themselves. The more you intervene, the longer the problem sticks around because they have to work it out between themselves. Obviously, if the older cat is really beating up the younger one, you should stop it, but spitting and growling are a way of telling each other where they stand in the hierarchy.