House Training a One Year Old Dog?

We are having trouble house training a 12 month old St. Bernard. When I first got her, at 5 weeks, my wife told me she was not "weaned" by her mother. She rolled in her own urine and feces, and it took me 8 months to finally get her to stop. When I leave her alone, or leave the house, she jumps on the couches and goes number 2.

We haven't had an accident for months. Last night I took her out before I went to bed and not even an hour later I heard her urinating in her cage. I took her out immediately and cleaned her cage. She has done it 5 times since then and also goes outside. My question is, could it be medical or her in need of intense training?

By reaper6niner