Uke Can Help

I was not much of a Ukelele enthusiast until a young music student brought me his Uke to tune. 
I had no idea what kind it was , I measured it and looked it up and thought it was a tenor and tuned it to GCEA. Oops. Unfortunately it sat in my school room for at least a month with that incorrect tuning. When my student came to retrieve it, it didn’t quite sound as lovely. The neck was warped and now I’m replacing the instrument a Kala KA-BE . Any help from a Uke fan , musician or anyone willing would be truly appreciated!