Awww, I am sorry to hear that Lexie gets so upset...Unfortunetly I do not have any advice for you because my Sammi is the same way only she does not howl, she pees on the floor and then hides until I come home...Like she is doing pee pee out of spite...I am sure someone here will have good advice for you...For me, I just tell her BAD GIRL, PLEASE DO PEE PEE ON YOUR PAPER until the next time
Good Luck!
Fran