ok i just get through this quickly but you can try ignoring her as soon as samantha starts to play bite walk away and totally ignore here (it is the worst thing you can do to a dog that wants to play) also try wiping bitter apple on your hands/arm and anywhere else samantha trys to chew.

and teach the children from the word go to have respect for the dog, and not bother her when she is eating/drinking/sleeping etc and get any future children to work with her on obedience/exercise/feeding etc

good luck hope that was helpfull