This being an old house (1910), if we go away for more than a couple of weeks, we'll sometimes have mice in the house when we return. With some exceptions, including one mouse that she decided to grant amnesty to, Ella gets right on the job, and will wait for hours at a point of entry until she dispatches the intruders. However, after she killed one and remained vigilant, I bought a couple of traps on Amazon, looking particularly for ones that Ella wouldn't get her own nose or feet caught up in, and these worked great. They stay in place, allowing you to trap more than one mouse at a time.
A word of caution though; these aren't traps that you want to just leave out and forget about. They are live traps but I learned from personal experience that if you leave them in there too long, they die and soon begin to smell. They come in a two-pack.
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