ive had my pacman a little over a month, and she spends 85 percent of her time under ground. when i first got her, i was worried about the same thing. i didnt want her to hide so long and go hungry. so what i did was uncovered her head, then about half hr later go back and put my hand behind her or from the side and push it into the substrate and scoop her out. i would sit her on the soil and try to feed her. after feeding or attempting to feed her, i would cover her up and let her be. she would stay out for a while then eventually go back to being buried 100percent again.
do you have three sides of her tank covered?