I think that problem stems from Lilly telling Mindy her side of what was happening to Paul and about his perceived laziness.
Mindy not telling Lilly to leave the room to talk to Paul alone to ask him what's been going on with him physically, emotionally and at home would have given Paul enough space to talk about Lilly.
Remember Kim and Mindy are Lilys oldest friends so there's a bias going on with what Lilly is telling them and what she has actually been doing.
I pull you in for a stong hug.
"Honey! He does care about you! Very much we both do! Your father just....he really has a mind that focuses on one thing at a time, so like if there is a big work project his brain zeros in on that. This doesnt mean he doesnt love you or care about you! Bedwetting or nor, diapers or not, pass fail, hes still your daddy and loves you very very much. And I do too princess! I understand your upset and scared about these tests but not doing them will only hurt you. Tomorrow you'll go to school and knock out these tests like a champ! You got this baby!" I hold you tight rocking a little saying all this with love and support.
"We are always proud to call you daughter, baby. Remember that. We always have you."