MY SNAKE WONT EAT!!!!!!?

My snake wont eat for some reason. She usually eats it right up. Shes supposed to be fed every 4days but its been six(the 4th day we were out of fuzzies,5th day she wouldnt eat,and 6th day she wont eat). Ive tried putting her in a lil box and sit the mouse in beside her. And ive tried cutting a slit in the mouse so itll bleed and let her lick it but she still wount eat it. I usually put it the microwave for about 10 secs until its guts are showing and she eats it right up! But my sister said it wasnt healthy for her. Its thawed all the way through, i put it between my fingers and squeezed. ive dangled it in front of er face shell look at it then slither away. Shes more active than usual and shes not getting ready to shed. Her cage might be to cold cuz i dont have a thermometer. I have a lamp and i have a reptile heating pad but everytime i go to pick her up she feels cold. How do i get her cage warmer(if it needs it) and get her to eat!!!!!!!! Shes a ball python