The biggest issue is how good your daughter is. If she is obviously one of the best players it will not be a problem, but if she is average and she plays over average Suzy it will be a problem. When Al McQuire was told by a player that he was just as good as Allie (McQuire's son), his response was " you have to be better".
Take the job and coach her like all the rest. The point of not being able to see her play if you don't is maybe the most valid one.