I'm with Mason on this one. I never would have reached my hand in my boa's cage on feeding day. You called the pieces "splinters", but were they actually imbedded in her flesh, or just stuck to saliva? A few swallowed pieces of aspen weren't going to do any damage. I'd be more worried about her grabbing a mouthful of paper towel, which WILL kill a snake if it gets ingested, since the whole sheet would get swallowed.