I would just leash her to you and take her out and wait it out.. she will eventually go lol and when she does go, praise like crazy + treat + PLAYTIME! Let her off leash after treats and play with her for a while in the yard, this will also start building up the idea that the yard is fun!
What really got Romeo solid was that he realized that ONLY AFTER going to the bathroom in the right place..does he get a walk. No more holding it, no more finding the perfect patch of grass.. Now I say the command and he just frikin goes lol
Its kind of understandable in her point of view.. the yard is wet or cold and inside is warm and she is there all the time anyway lol so I would just start building up how AWESOME it is to go outside
I would also go back to 100% crate and leashing her to you when you are home so she can't sneak off to go