how do you teach kids that sometimes, you won't get rewarded for your hard work?

I'm looking for some ideas as to how to handle this situation --10 year old daughter has seen a number of setbacks recently, and she's not seeing the results she was hoping for, despite thinking that she had worked hard and put in a good effort. Example being, not getting to move up to the next level in her music class despite practicing for it, not getting the grade she was hoping to get, etc. She has cried about it and saying what's the point of all that work if it doesn't pay off. If work doesn't get paid off, why bother at all?I would explain that sometimes, even if you try your hardest, things don't work out the way you want and it's ok to fail. You move on and try again on the next thing. You don't know if that hard work and the effort you've put in will come in handy sometime down the road.I can also tell her, if she tried, she has a bit of chance, but if she doesn't try she has no chance. Though that's not quite true because some chances are just very tiny it's never going to happen realistically speaking (like winning a lottery)Also realistically speaking, some opportunities would be lost forever but I'm not sure if I should tell her that message because then she might give up hope?Another reality is, she only thinks she's trying hard, but I could tell that there's room for improvement, there's always room for improvement. I wonder how much should I push to get her to work harder.Is it just something she's got to figure out on her own or should I somehow get involved? via /r/Parenting http://ift.tt/2xGjRNU