My wife let a mouse in the house too. It took over two weeks to get rid of it. Glue traps work BUT you need the kind that is pheremone-baited, one for males and the other for females (we got the one-size fits all, which was a compromise). You have to think like a mouse to know where to set these. I placed them underneath and behind baseboards, where they hide. You can imagine how tedious this was. Pistachio nuts were the bait- we don't eat peanut butter in our house. Peanut butter attracts ants.
By the second week, the wife was getting desperate and was about ready to hire a professional exterminator. My cheapness and intransigence finally won out. This saved me $150 but what a nuisance and annoyance. The little pest left a lot of feces in the kitchen, and that was where I set the traps. Rest in hell, filthy rodent.
Good luck to the homeowner. I can sympathize.