For chewing on electrical cords either don't let her in that area or put some stuff on it that dogs don't like. You can either buy a special spray or just look up some home made ones like alum spray or Tabasco sauce.
As for the play biting my dog used to do that too. What I did was train her with treats. I would touch around her ears and stick my feet in her face and if she didn't bite me I would give her a treat. If she did I would just say NO loudly and start again. Now she is 7 months and doesn't bite at all. Remember patience is the key, she just wants to play and is used to biting her litter mates.
Hope I helped!!