Kitty farts

Juniper is about 6-7 months old now and she seems very healthy. The problem is she has bouts of super smelly gas. She was dewormed twice before I adopted her and once with me a few weeks ago. Tested negative for worms 3 weeks ago. She was given Covenia and VetriScience Lysine tabs 2 weeks ago for a cold. She's still on the Lysine and also gets 1/8 tsp vet supplied
probiotics because she's had gas since I've had her.
She eats about a 3 oz can of Nature's Variety rabbit and about 1/4 c. of Royal Canin GI formula a day. I feed her this because my Siamese mix eats it and I want to get them on the same food.
Anyway, she's a food HOUND and I was even warned from the rescue how crazy she is. She wolfs her food like there's no tomorrow but is getting better. I don't give her much kibble at once because she'll throw up otherwise.
Any ideas on why she's so stinky? Every time I lift her, when she's relaxed or even plays, she farts. Sometimes I hear it which makes me laugh but I'm still worried. I've talked to the vet and that's when he gave me the probiotics but it's been weeks already.
Also her tummy gurgles a lot. Any advice?

I'm not a vet, but I'll share my experience.

Six years ago, a guy at my wife's work found a kitten crying is his front lawn.

He brought it to work and of course, we brought him home.

Oliver was only 4 oz, but full of life. He thrived, but always had loose stool and gas.

I guessed it was because he did not get moms milk  for as long as he should have.

Anyway, he thrived for years with gas and a stinky butt. I didn't think much of it because he was such a happy cat.

In hindsight, I believe he was suffering from IBD. 

I believe the IBD progressed into lymphoma.

In the middle of Dec Oliver started throwing up regularly. The vets could not find anything. Blood and poop were normal.

Finally my wife demanded an x-ray, they found a mass. The ultrasound proved it to be a tumor. The oncologist found another.

We than elected to put him down rather than spend our last days compromised, poking and prodding him.

Please consider that your cat may have IBD before it gets worse.

Molly22 said:

She eats about a 3 oz can of Nature's Variety rabbit and about 1/4 c. of Royal Canin GI formula a day.

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Love that name, Juniper, btw    It looks like the RC food is really high in fiber, which could potentially cause issues like gas.  If she tolerates the Instinct really well, I'd consider rotating proteins so she doesn't develop a sensitivity to the rabbit.  It's always best for sensitive tummy cats to give them variety in the way of protein sources while keeping other ingredients minimal.  I love Instinct for this and feed it to my IBD cat.  

Not to stir the pot or anything, but after years of researching IBD and discussing it with different vets, I've learned of an emerging theory that IBD and intestinal lymphoma aren't related.  Newer research points to a pre-lymphoma condition that mimics IBD, while IBD itself can't turn into lymphoma.  IBD is far more common and so I wouldn't spend any precious time entertaining thoughts of seriously nasty things going on your kitty's GI tract.  Food sensitivities and allergies are usually culprits.