Oh my gosh, I don't know. I just know that I have a similar dilemma. My DD (only child if it is relevant) is 13 yo, county/regional level at a sport. She certainly has potential to go far - her coaches want her to up her commitment as they recognise her potential and can see her at national level. In the past she has said she wants to push herself as far as she can go, yet at the same time gets really nervous before she competes, and often says she wants to quit just before the comp starts. She then goes on to perform really well!
She is getting to that age where she would prefer not to do anything - she has given up loads of hobbies/sports, which feels like a shame, but we don't want to dictate to her how she lives her life. However, she is now saying she wants to stop the sport that she is really good at ('I'll take up something else so I don't get unfit' she says).
Our issue is should we encourage/make her carry on despite getting nervous and saying she wants to stop, because this could all be tied up in performance anxiety about not winning (she is a perfectionist!), or should we let her stop and then have her turn round when she is older saying we should have made her carry on as we knew how much she wanted to succeed!
I wish I knew what to do for the best! You read posts form people saying they wish their parents had let them quit activities, plus posts saying they regret their parents letting them give up!
Sorry for the hijack - it is just quite an issue for DH and I right now! I hope this acts as a bump!
As for what you should do - can you tease out whether she is bored/feeling not so good as the others (could this be improved if she did some extra?)/has had a row with someone else in the boat/dislikes the coach/wants to go further but is scared/doesn't like your involvement in her hobby??
I guess my answer is you need to find out more from your DD about what is really going on
. Good luck!