If you can get her alone, you can offer her a bit of canned food with psyllium (unflavored Metamucil) fiber supplement and a bit of extra water mixed in. It's been shown to be safe for cats, and Smudge is a lot more comfy for it! But then, he dislikes pumpkin, and quite a few cats seem to enjoy it (some even like it straight up).

Love, Columbine