Poor baby! She just sounds sensitive and making not taking all the changes so well.
I would just start slow. Work on building up positive associations with the outside again, since she used to love it so much, it should come back to her. Get one of her favorite treats... if possible, use human food like pieces of chicken, etc, so it's REALLY rewarding to her. It's a treat that only comes out when she goes outside. Throw pieces of chicken on the ground outside so she's moving forward and focusing on the food rather than being worried or frightened.
I would just do this every day, and don't ever force her. Let her make the decision on her own so that she realizes "oh, hey, that's right! I love it outside!"
One time, I pinched Jackson while putting on his harness by accident. The buckle I guess kind of pinched him and he yelped. So for a few weeks, he would run from me every time I'd go to put the harness on. I basically had to de-sensitive him to the harness. So, I brought out the clicker, some tasty treats, and started slow. I put treats near the harness, so he had to go over and eat them... then I put treats ON the harness. Then I would feed him a treat while putting the harness over his head, but I'd take it off real quick, etc. Just building it up until I fully put the harness on again. Now he's fine with it.
And Jackson's a pretty sensitive dog too. What I mean is... a few weeks ago, our stove started smoking when we were cooking and the really loud fire alarm went off. He was SO scared! He started shaking, etc. Well, a few days ago, the oven at my father's house started smoking but there was no fire alarm. But the smell of smoke, he now associates with the loud scary sound. He remembers everything! So now I've been de-sensitizing him to it, and I give him a ton of treats anytime that now happens.
Here's a video about the very thing you're talking about, it's just given with an example of a dog who is frightened of a kitchen floor.