Last night my female piggy of 1 year started showing signs of constipation (she is stiff, has dark soft mushy poop, struggles/makes noises while trying to poop) and she only eats Timothy hay and drinks water. I tried feeding her some apple skin and watermelon, but she wouldn't eat it. I tried feeding her normal guinea pig pellet food and she wouldn't eat it. I also tried feeding her 0.5 mL of extra virgin olive oil with a plastic spoon to soften her poop, but she wouldn't drink it. I didn't have a syringe to feed it to her orally. Also, I changed her diet yesterday before she was constipated, and i figured that that might be the cause of her constipation. I can't go to the vet because I don't have that much money so I need home treatments for my guinea pig's constipation. Please help, thank you!