Franklin has has a lot more accidents lately now that's it's cold outside. Do you have a coat or PJs for her? I know it sounds silly but you can obviously tell she's cold, so.. why not?
Franklin and Maggie wear pajamas and a big warm coat when we go outside. Then we walk a lot. I don't know if you have a backyard, but we live in an apartment so we have no choice but to walk around. If she's just sitting down in your backyard, try putting a leash on her and walking around. We just walk and walk and walk until he pees. Franklin is slowly learning that the faster he potties, the faster we go inside!
Oh and make sure you bring super special treats! Until then maybe you can get some diapers to save your sanity?