seredni, you are so cute! and very kind
I feel the same way - or used to - hm
and I tried to humanely catch and relocate - many died anyway, some got relocated
and now I got venomous snakes that moved in because our run smells like mice so badly even I can smell it
the snakes are hibernating now - and now I got to decide if I want to face off with copper heads and kill them while it is cold - I think they found a hibernaculum in an old ground hog hole next to our basement
better to be aggressive about the mouse problem early on
short of killing them - disturbing them daily may be a good strategy - and I would move that one mouse out! I know it is cold outside and it may not make it, but I would move it out while the problem is small and then check in all spaces for more mice and move them out of disturb them - our mice were/are nesting under the rubber mats I put down in the run to catch the spilled food under the feeders - no perfect solutions! sigh.
maybe you can find a sheltered place for the little mouse, under leaves, or even let it have an old towel out in the woods and some farewell chicken feed - but I would move it far enough away so it would not come back easily - I move ours across a creek into a wooded area that has hiding spaces and water for them to start out a new life, hopefully and I release any mice from our coop there so they can reunite, maybe