Astro-turf is a breeding ground for bacteria. If you switch to Cypress or Aspen, you will be able to hold the humidity much better. You can also use newspaper or paper towels, but they won't assist you in keeping the humidity up.
I also don't see the need for a night time drop. Keep your basking temperatures 90-92 and ambient temperatures 82-84 twenty four hours a day. You aren't breeding, so there is no need for night time drops, they will just cause you problems.
Your Veterinarian will be able to tell you if she has an Respiratory Infection or not. It's impossible to tell why she has a Respiratory Infection. Low temperatures and low humidity certainly can cause RIs, but if you correct your husbandry issues, it shouldn't be a problem in the future.
Good luck!
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