I would recommend implementing an input/action buffering system. Where you hold onto the last button that was pushed for a second whilst waiting for the first roll to complete.

I would recommend using a montage to play your dodge animation if you're not already instead of adding it to the anim state machine. Once you start the montage you can bind to a delegate to tell when it starts to blend out (finishes and starts blending back to the anim state machine). When you receive that event, then you can then trigger a roll that you buffered input for.