Is it Albon that you are using? If so, yes, it can cause diarrhea and dehydration.
If your kitten is 4 weeks old, you can start giving her quality canned. I suspect her digestive system is looking for some meat protein now. The best canned kitten food I could find is Kitten Wellness. To make the transition on her digestive system easy, you can mix half KMR and canned. You may find that she plays with it, sits in it, runs in it, but she will lick it off herself 
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Cat maid to:
Puddles, female Himalayan (16 yrs)
Jasper, male Ragdoll ?? (approx 9 yrs)
Sweet Pea, female silver tabby DSH (approx 7 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 6 yrs)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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