Did u just change her FM, that's y poo after each feed? What about her poo freq before drinking this FM?
As some bb also poo after each feed of breastmilk, i'm not too worried if bb also poo after each feed of FM, esp if the poo consistency & color seems fine.
I'll change FM only if bb constipates or has diarhoea after drinking it. If you are concerned, then maybe take pic of the poo. Then go check with PD?