Thanks, I don't have it anymore. I don't know what I would have fed it if I kept it but will look for more in the same location when the snow melts. I may try keeping some immature spiders in the future to see what they become though as my husband wants to get a another Praying Mantis and if he does I plan on sharing crickets with him.

I think it bears a resemblance to these. You're probably right that it's a juvenile though aside from size I don't know how to tell.

It does look similar! I say juvenile because the palps aren't enlarged (if it's male, it's very young), and there's no epigynum visible in the ventral shot like in your adult female here (the dark structure near the front of the abdomen):

OK, thank you! I didn't realize the epigynum might not be visible in an immature female. I figured my picture wasn't clear enough to tell but thought the line on the sternum might help with the ID.