If you had no intentions of showing or breeding her later I'd suggest spaying her now.
In my experience if the dogs do it of their own volition they always get pregnant especially if you do not want the pups.
If this was another breed that bred her you may be looking at a c-section to deliver pups. You might find that is true anyhow as she is so young.
The mismate shot carries its own risks as it can lead to deadly uterine infection and prolongs the heat season.
Talk with your vet about any choice you make on this.
Plan on pups any time after 58 days from the tie and x-ray her a week before she is due to see if its one huge pup or if a c-section is likely to be needed.
Hope this helps you!
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