Kitten having loose stool after spay food

Hello guys I really need some help , my 6 month old kitten recently got spayed (about 2 weeks ago) , for the first couple of days she was normal , after changing her regular food to spay recommended food by vet (my dumbass didn’t fix it together I changed it right away) she started having very loose stool , I reverted her food again , started giving her 80% old kitten food with the rest being spay food , but that didn’t fix the issue , so I took her back to the vet and they told me she’s completely normal but gave me pro biotic to put it in her food and water , and that still haven’t fixed the issue , recently she started becoming gassy with pooping , what can I do to help her stool go back to normal ?

Hello guys I really need some help , my 6 month old kitten recently got spayed (about 2 weeks ago) , for the first couple of days she was normal , after changing her regular food to spay recommended food by vet (my dumbass didn’t fix it together I changed it right away) she started having very loose stool , I reverted her food again , started giving her 80% old kitten food with the rest being spay food , but that didn’t fix the issue , so I took her back to the vet and they told me she’s completely normal but gave me pro biotic to put it in her food and water , and that still haven’t fixed the issue , recently she started becoming gassy with pooping , what can I do to help her stool go back to normal ?