it may not even be real drama but if EG is as crazy as she seems, maybe she thought JO was in the way - maybe EG was the paranoid/jealous type? its also been speculated on here EG wanted her own family - maybe if JO was gone itd be like Lucas was really hers? maybe its entirely EG being petty - there was once the incident at the school when EG failed to pick up Lucas so maybe EG would pounce on any opportunity to one-up JO/JOs family?
imo, the drama wouldnt have to be concrete/something your normal adult views as drama or conflict but something that would rile up a crazy, unstable person, if that makes sense.
Makes me wonder if EG thought about harming JO.