Sorry, I haven't grown 'Miss Ruby' or 'Ellen's Blue'.
Like I mentioned, I've grown 'Buzz Magenta' and 'Buzz Velvet' which are compact butterfly bushes with large flower spikes. 'Buzz Velvet' is the prettiest of the two in both color and form. Mine are in containers so they get no more than 3'x3', but in the ground they aren't supposed to get any bigger than 5'x5'.
It's seems a little early to know for sure if your 'Ellen's Blue' is dead or not. Even if the wood is dead they can sometimes re-sprout from the roots. How big was the plant's rootball when you planted it? If it was a tiny mail-order plant then it may not have had time to establish itself before the cold weather set in.
I hope that someone that's grown those two cultivars chimes in soon for you.
