A year ago we purchased a full grown crepe myrtle. It was a beautiful accent plant. Four strong trunks that reached 6' high and when it bloomed, it was glorious. Winter came, winter went. Everything in the yard leafed out but Myrtle. She just stood there. I said give her time, she's a southern belle and may be a late starter. Oops, we were out mowing and bumped one of the trunks, it broke off below ground level. Ditto for the rest. A week later we decided to dig Myrtle up and return her to the place of purchase. She had a one year warantee. My husband started chopping away at the soil and luckily I was out with him. Stop! You're killing her! You guessed it. Those little red shoots were making their way out of the root ball. We now have a shrub that's waist high and covered with blooms. Myrtle doesn't know it yet but she'll be getting a haircut following Dave's instructions.
I'm so glad you were able to save her! They are so resilient they just wont die. I'm guessing you should have a beautiful tree next year. Wait on the haircut till spring and by next summer she will be on her way to becoming one tall regal beauty! Good Luck!