Hi, welcome to Pet Talk! This will take some time, and consistency, but you can train her back into being okay with the outdoors at night.
We had a similar thread recently here, but I will tell you what I told her before she got the medical diagnosis:
Do take her outside after dark, and stay out until she does her business. As soon as she eliminates outside give her a treat, and lots of praise. Do not "baby" her - relax and consciously act like nothing is wrong. Do not cajole and try pleasing, coddling her will reinforce she should be afraid. Be patient - even bring a flashlight and book with you, spend non-stressful time with her outside and praise praise praise. Take her out for a short walk, the next evening a longer one, and even longer. Work on any commands she knows when you are outside, run her through sit, down, stay, spin - whatever she knows so she associates being out there with happy things, and with a "job" to do. Does she like to play? Get her excited with a ball inside right before you go out - when her leash is already on, grab a ball, bounce it, etc. so she gets more interested in it than she is afraid of the dark. And when you are outside, stay calm, deep breaths, and keep her interested in whatever way you can, have her focus on you.
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