Boston Terriers

We brought home a second boston (this time female) 3 months ago (feels like 3 years ago at this point) We are a week past 5 months in age and we are having a heck of a time housebreaking her. In addition to her digging and biting of our male boston during play her using the bathroom all over our house is making us heavily consider giving her up. Today alone consisted of 3 number 2's and 2 number 1's in the house despite hours of outside time ( we let her out every hour for about 20 minutes she is kenneled when at night and when we are gone) Is this going to get better or do we have a "bad girl?" Shes very sweet but she has put us through massive stress over the past three months. We positively reinforce going outside at least a couple times a day, but not every time at this point. Comments and suggestions would be appreciated. Thank you.