Thank you for your query,
Simple common cold
in the last week may not be associated with the tiredness
As you told she is looking yellow, jaundice
has to be looked for.
In case of anemia child looks pale and get tired easily.
Try to give plenty of oral fluids and check her body temperature.
Consult your Pediatrician
for the complete examination of your child to look for jaundice and for the causes of her tiredness.
Hope I have answered your query.