6-month old puppy backsliding
I have a wonderful six-month old maltese/yorkshire terrier mix female puppy. We brought her home around 9 weeks of age, and we immediately started training her. She learned quickly and progressed very well.
About a month ago, however, she started backsliding considerably in the housebreaking department. In the past month, she has had at least 4-5 accidents per week in the house (usually peeing), and I can't figure out what is going on or how to fix it. My only theory is that once the weather started to get warm, we began to allow her to spend a good bit of the day in our fenced backyard with our two outside-only dogs. Before that, she spent most of her days in the kitchen (with baby gate) while we were at work. We still bring her inside in the evenings. Is it possible that she is getting confused? My other theory is that she is somehow feeling neglected, but I feel like we're still spending a good amount of time and attention on her.
Any ideas? Help!