J.F.
please tell the coach and in your own words just as you have explained here. trust that the coach will make an adult decision. i think by not telling the coach is holding back on information that is vital to the wellbeing of your daughter's health and actions. You can enlist the coach in helping your daughter succeed by being totally upfront and honest about how her treatment and diagnosis is coming along and expected times of return to full health and by emphasizing just how much this really means to your daughter. Then let GOD deal with the rest. (do not worry about playing sympathy card your daughter certainly deserves any she might get it is never good to worry about that beforehand... those who use the sympathy card we are all too aware of... the coach would not think she would be burden to squad if she is aware that the back issue most likely is a temporary disability. I personally would keep her out of any other activities let her back rest to improve her health faster to be better able to compete however maybe ask her to warm up and stretch or light yoga as the date comes nearer... i know with my own back problem the faster way i had to recover so quickly as i was alone with toddler.. was pure rest ... and of course pain pills for those times its intolerable.. good luck to you ps dont mind my opinion and hope it might help feel free to select and choose... ;)