There isn't much space to move in Lillian's stomach. As though a direct reflection of the rest of her body, her stomach walls deftly mold and squish you with powerful contractions. Her body starts secreting powerful acids to break you down into mush she can absorb.
Meanwhile, Lillian walks over to her car, tired out from her rigorous workout. She has to push the seat back all the way in her car in order to make room for her largely extended belly, but manages to manipulate the controls and get you both to her home in one piece (literally).

Groaning with the effort of moving sore muscles and extra weight, Lillian gets out of the car and makes her way into her home and over to the bathroom. "Boy am I pooped!" She exclaims. "I won't be the only one, pretty soon." she adds with a smirk.
Getting into the bathroom, she settles herself on the toilet. From where you sit in her body, you can hear the flowing of liquid somewhere below you as she empties her bladder into the bowl; it's a very morbid kind of feeling to think that you may soon follow the same route if your hunch about indigestibility is incorrect. So far so good though; you don't feel like your skin is on fire or anything...

Lillian takes a shower to clean up after peeing and slips into her nightgown, then slides into bed and turns on the TV. "You really are a professional, aren't you?" She asks. "Most people I eat spend their last minutes alive begging for mercy and for me to spare them but you've been contentedly digesting like a good little morsel."