WHY WILL MY GOAT WILL NOT STAND UP?

SHE HAD A BABY ABOUT 1 1/2 YEARS AGO. SHE EATS GOOD AND HAS PLENTY OF WATER TO DRINK BUT I CANNOT GET HER TO GET UP. SHE HAS A STALL OF HER OWN SO THE OTHER GOATS CANNOT GET TO HER. I CHECKED ON HER LAST NIGHT AND SHE WAS ON HER SIDE. SHE REALLY SCARED ME. I WENT IN TO CHECK ON HER BUT SHE DID NOT WANT TO GET. HER STOOLS HAVE CHANGE TO A SOFT AND CLUMPY. I HAD GIVEN HER SOME WORM MEDICINE ABOUT A MONTH AG0. HER SIDES WERE VERY PUFFED OUT BUT, NOW ARE NOT AS BIG AS THEY SEEMED. MY NEIGHBOR WAS POSITIVE THAT SHE HAD WORMS. AFER A FEW WEEKS SHE SEEMED JUST FINE. THEN I WENT OUT ABOUT 3-4 DAYS AND THER SHE SITTING ON HER STOMACH WITH ALL FOUR LEGS FOLDED UNDER HER. SHE IS NOT AS PUFFED UP AS SHE ONCE WAS. DO GOATS LAY DOWN ON THEIR SIDES WHEN THEY SLEEP? I HAVE TO PULL HER UP BUT