Kirsten,
You are among the BEST cat Meowmies I know! Please don't blame yourself. I think cats are forever toddlers and there is just NO WAY we can keep them from getting into things if that is what they set their mind to - unless you choose not to sleep, use the restroom or turn your back to eat Lily is one ...uh...determined (thank you CCL) kitty and I suspect she will keep you vigilant until she is geriatric and even then she will probably dream up things to try