I believe you may have hit the liver, and maybe some of the stomach/intestine area. Generally, a liver shot will bleed fairly well (This is, of course, circumstantial). However, if you hit the liver and the stomach/intestines, it has been my experience that the stomach matter, as well as the acids and other stuff in there, will clog up the entrance and exit hole and make trailing difficult. From my limited experience, when a deer is hit like this they bleed best when they are running, and keeping their blood pressure high and that wound pumping.
You didnt indicate how hard it rained. A real hard downpour might make it difficult. A light sprinkle might not have mattered much. I would go back , try to pick up the trail where you left off, and keep your nose to the ground...literally. Get on your hands and knees if that is what it takes. No blood, try to follow her tracks. If that doesnt work, then......
Find everyone you can and organize a grid search. Keeping searching until you find her or until all hope is lost. I will not, under any circumstances, hunt again until a deer I hit is recovered, or until all hope is lost. Typically, I will give up after two-three days after the hit.
That said, if you think the hit was back you should have not trailed her that evening... If you are EVER unsure of a hit, the best thing is to wait, wait, wait. Odds are, if undisturbed, that deer will bed down sooner rather than later. An hour is nowhere near enough time, especially when you are unsure of the hit. An hour is what I typically wait when I hit a deer right in the boiler room.
Ps. If there is a water source in the area, make sure you look in that area, especially if you find the trail trending in that direction.
Hope this helped....
Good luck finding her!