Sounds like you have got a couple of con artists next door. Could be that they are trying to setup their next scam, but there is always the possibilty that she "is" telling the truth. I think that the idea of the video camera is an excellent one. Wow... what a bust it would be to catch her trying to get bit!!!

Might want to hint at the idea that you may already have video surveillance and she may back down. Otherwise, make it near impossible for anyone to come in contact with your dogs while you are away!

Good luck!!!