Oily Substance

I went to change the water in my chin's water bottle yesterday and noticed an odd odor coming from the cage. Upon further investigation I found a wet spot underneath her bedding and assumed she had just urinated and didn't think anything of it. This morning I went to her cage to feed her and investigated the area and noticed that it was still wet but the substance was more oily than urine like. I cleaned the cage and found another spot in a different area that contained the same oily substance, it doesn't have the ammonia smell of urine but the odor is strong. Does anyone have an idea of what the substance might be? I haven't changed anything in her cage except the bedding switching from Eco-Bedding Odor Control Crinkles to CareFresh Crinkles.