Trusting, I am so sorry to read of recent events in your life. However, I applaud you for being so strong it will not have been easy either for you or for your precious daughter. My thoughts are with you.
When you seek sole custody will you be doing it for your older children too? That is what I would be doing. As you say OWs 8yr old learnt this somewhere and I wouldn't want my D14 to be exposed to that anymore than I would a 5yr old.
Me 43 XH 45 M 2.7.88 Divorce 7.10.09 Kids D20,S17 & D15