My 11 month old puppy seems to be regressing in her new enviornment..need help training!?

I recently moved in with my mother-in-law while my husband is away in the army. At home we had her potty trained, and only fed her cookies infrequently as a reward. My mother in-law has two 7 month old puppies who are spoiled rotten with an ever flowing amount of cookies. I have told her my dog does not eat table food nor does she need cookies all the time, however I am constantly taking cookies away from my dog because since we moved in she hasn't eaten her dog food. Also she seems to have a problem going to the bathroom in the house again even though I let her out every two hours...HELP!!