Hi...I have a cat that is hacking up white foamy stuff...any clues? She's a "hider" so I dont know if shes eating or using kitty pan..but she still looks quite plump, so Im guessing she is eating after we go to bed, or when house is quiet...shes aprox 5 yrs old, we took her in from an elderly lady 2 years ago, no health problems since or before.Thanks