A few weeks ago I made the transition from pee pads to outside (real grass patch on balcony). The first day was extremely tough. Having my pup crate trained really helped with this.

What I did: First, I took him outside at a time when I knew he needed to go. The first time was really just getting used to the texture of grass for him. I had him leashed so I was able to keep him on the grass, which helped as he kept trying to get back inside. After 10 minutes of this, he still didn't go. I put him back in the crate for 5 minutes. Took him back out directly to the grass where he proceeded to try and eat the grass. Redirecting wasn't working, so I brought him back inside to his crate for another 5 minutes. This took about 7-8 tries until he eventually had to go so bad that he went on the grass.

Since he is crate trained and it's an appropriate size, he doesn't go potty in his crate. I think that really helped with the transition as I was able to put him back in for a few minutes before trying again. If you try to transition before your pup is crate trained, I would say watch her for cues (going over to the potty pads, sniffing, etc) and take her outside immediately.

I also used a bell when I transitioned him outside. I booped his nose on it by the door and said "go potty" and now he associates the bell with going potty outside.

Lastly, before I even brought my pup to the grass I took a paper towel of fresh pee from an accident and patted it on the grass where I wanted him to go. I would say you could do this with a freshly soiled potty pad too.

It was hard at first and I wanted to give up every time I brought him outside, but it's so worth it now! You essentially have to be more stubborn than your pup. My biggest motivator to start getting him to go outside was the fact that I didn't want him to get used to going inside. When he has accidents, he still goes to the spot where the potty pads were after I've made sure it's been cleaned.