as court records have shown... she continued to receive benefits for her dead Father.. long after killing him... to stop receiving the benefits she would have needed to provide a Death Certificate.. something she could not do... also allowing Family members to 'help arrange' a funeral..she also couldn't do because he was buried in the garden... I'm not sure what else she could do whilst continuing to hide her Crime.. 
the Father was Filth... and should have been dealt with long ago...
the Daughter/Victim/Killer sounds like she lacked social skills.. however reading her 'life story' it's no wonder... I feel sorry for her