I think its a bit sick to keep the chick alive for snake food. Its very easy to do a home euthanasia, and if she's okay with keeping it alive to feed to someone's snake, she should be okay with doing the euthanasia herself. As far as not having enough time, it takes much more time to keep a chick alive than to euthanize. If she's not strong enough to do it maybe she shouldn't be raising chicks, or be willing to take the chick to the vet to be euthanized if she really can't do it herself.