The best way to find her name would be through the census records-depending on when she was born. If you have Lena's husbands name and know where they lived I would be happy to search and see what the names of their children were in prior years when they still lived at home.
I see that Lena passed away in Polk County-so I checked the two Shorts that were listed there in 1920 and didn't find Lena in either household. I found numerous Shorts listed for Jackson County-if there's a possibility that they lived there. What does the obituary say? Laura