Feed the dog it's big meal, it may have to wait till morning, keep the dog crated or penned for the next 45 minutes. When the times up then take the dog outside for a walk, bring high value treats with real meat like chicken, left over roast (not just the fat or skin or barbecued, spicy but plain, or if you have even hamburger patties, fry one up the night before, hotdogs are also a miracle treat, you can cut it up in over 40 pieces to use as reward coins, and smaller dogs cut the coin in half or quartered. While these treats are generally bad for a dog you will be using them as a super bribe for one or two days then switch over to a dog treat you will be using on a regular basis.
After feeding then waiting (a normal healthy dog, weather housebroken iror not won't soil it's confined area). Carry the dog outside to empty, try a walk around the yard to see if she needs to empty, then go around the block. You may be bleary eyed and tired but making the dog trot alongside you after it's eaten will move things down the one so to speak, and while she can hold her potty almost forever, it's hard to keep the poor from moving especially when moving her intestines walking next to you.
I've had several dogs that were never potty trained by 5 years old and had to teach them peeing outside gave rewards and pooping the same, one dog cowered when he pooped, he expected to get hit by me when he went, I gave him many many pea sized pieces of boiled chicken, rocked and held him besides praising him with my voice because he was so afraid he would get hit for emptying. The owner just before me said it was so bad he ate his poop if you didn't clean it immediately. I won his trust over in less than a week. He loved the hugs and kisses, themany treats. In all the most he got in a day ESP 4 ounces of chicken breads, the vet said it was safe on his tummy, digestion and was low calorie by comparison to some other type treats.
Whatever dog I had the dog would empty then have about 45 to 55 minutes run if the house then confined to a 4' by 4' penned area, I watched the dog for wrestessness, sniffing etc then we would go for another walk until successful then back inside to be free, back in the pen when time was up then back outside.
It's a wait it out reward only the good behavior timing thing, but it works. Many dogs have not been taught to empty outside, people will scream at the dog, hit, kick or beat the dog some 2 to 30 minutes more after the dog empties in the house. It does not do any good to correct a dog after it has done something, its brain and thinking patterns are so much different than ours. They only understand the now so if it's in the process of urinating, or the poops just starting to fall is the only time the dog can be coerrected. Ever heard of out of sight out of mind? It's pretty much hoe a dog lives. Once something's done the dog doesn't think about it, punishing it half an hour later is hat as effective as your mom grounding you or slapping you for something you did 6 months ago. Your dumbfounded and confused because she was upset about..you know...... the dog is just as bewildered why your upset because you found poops on the floor. Everyone poops you know. Most humans sont understand that the dogs cower not because they pooped and they feel guilt or shame, it's that tone you get in your voice.,. You know the one most people use.....'COME HERE..,NOW!!!! Did You Do This????? Are YOU GUILTY???' The dog cowers from the tone of your upaet displeased voice but the dog doesn't give a rip about the poop, that was there before they got yelled at. They cannot help how they think, however they live leading us and they live their treats. If your dog has a high play drive then use a favorite toy instead or whatever your dog works for.
The longest training I had to do with an adult dog was 4 days, they do have to be confined at night becuse if old habbits. They learn quickly to rmpty outside but some need to be reminded because of habit, if they have an accident, clean it up, no fuss, why set training back. When you go out for your potty walk or "break time" as I gave trained my guys for, I have an upbeat voice and make it sound fun, they know the difference between break time, play time and exerceise. My working dogs also know 'go to work'
This is how we retrain dogs or train ones away that hadn't been worked with much or at all and I have had great success using it the past 30 years. All dogs are different, some get the idea across sooner than others but they all eentiwlly learn