My Cat Pukes At Least Once A Week...But Why?

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My cat has always puked..virtually from the first day we got her from a shelter. No-one there said she had a problem with puking so I can't understand why she's doing it now. At first I thought it might be Fur Balls (or Fur Sausages as they should be called) but I've noticed she pukes..er..just the food now, which she did about 15 minutes ago. What kind of food does she eat? Tuna in Spring Water from M & S don't you know (it's on offer there) and she loves it. We were advised to give her this type as brine damages cats' insides, apparently. As far as portions goes a tin of (adult) tuna lasts 4 days. She also eats munchies which she eats when her portion of tuna has been wolfed each day..so she will eat them at night-time, usually. They are very good munchies with lots of wonderful ingredients to keep cats healthy, including vegetables and stuff to stop her from being sick! The brand is James Wellbeloved and we actually bought some from the shelter, initially...and was told that Flojo loves them. She does..but there's one slight problem. She doesn't chew them properly. Whenever she is sick out they pop whole! She does chew the odd one but not all of them. Why she does this I have no idea. The puke is evenly split between the tuna and the munchies, so it's not like she prefers one over the other. We groom her too as that helps with the Fur Sausage thing. I've not seen any Fur Sausages for a while but she's still being sick. One thing I have noticed with her is that she makes strange sounds with her mouth. Now, I don't think for a moment she has a loose tooth or anything as there would probably be a smell associated with that...but could it be something regarding her mouth that's causing her to be sick? She does wear a collar but I check it regularly and it's not tight around her neck. Can anyone give me any pointers as to what may be wrong here? She's not even 3 yet. If someone suggests I take the collar off then I shall as she is microchipped. It was hubby's idea for the collar as it's got her name on the front and our telephone number on the back, just in case she makes a run for it! I would say she spends 98% of her time indoors. Her Daddy will let her out when he has a smoke and when the weather improves I shall peg the washing out and I will invite her outside with me. Is there any such thing as Indoor Catnip or grass she can chew? Well, at least the vet is down the road if she needs to be examined. Bit of a "dear do" though.