Exactly..
Unless the child is crying and tugging the ear, you don't know and if she were doing that, she has an ear infection and needs to see a doctor. If a child has an earache, they have/had or will have an infection. How did she know she had an earache?
This whole questioning about it is ludicrous because DB lies. She lies about almost everything. She exaggerates and then she will minimize when necessary, either all for attention, or to protect herself.
The entire musings about Lisa having a cold, earache and cough could be all lies. We will never know what condition the child was in but I suspect healthy. DB may have made up the 'fussiness" as an excuse of why she was placed in her bedroom for all the hours in question.