Hi, my 3year old have been having very yellow and very slimey stools for a few days now. she has no fewer, food appetite and plays like normal.

Likely not important: Stool color is provided by the bile added to digestive debris. It starts out dark green & transitions through light green/yellows/browns as the gut germs metabolize it. Yellow just means it moves trough quicker. The slime likely reflects a food reaction or minor viral irritation. It should pass soon. Apple sauce & bananas would slow her down.