My finger's sticky...
She never says "Thank you for the meal", not even simply "Thank you".
Lick-lick
Sip-sip
Sucking and licking your finger are her indications of finishing the meal.
*Burp*
She's merely eating the food, thinking it is granted, since in her opinion the food is prepared for her as a matter of course.
You might feel disgusted, but you can never shout "Whoa".