ds(14) has been in a club since he was 7 - he currently swims 6-7 times a week for 2 hours at a time with land training twice a week on top of that
the only way I can manage it is by sharing lifts with other parents
our club is full of parents who're convinced their dc is going to be at the Olympics ... but the truth is it's extremely hard to make any kind of impression in swimming, partly because there are so many kids doing it and so few needed to be part of the team
it's also impossible to predict at 11 how good a child will turn out to be long-term as so many different factors are in play - height, body shape, motivation, luck, staying injury-free etc ... most of the best swimmers at 11 will have given up before they're 16
ds does it because he loves it - he actually prefers the training to competing, although he has a stack load of medals - he's always in a much better mood when training's on (the summer break plays havoc with his body/mind) and he needs the discipline and camaraderie, and the satisfaction he gets from simply being exceptionally good at something
some of the parents we come across cajole, persuade, bribe, even force their children to keep swimming, which seems complete madness to me 
dd's pretty good as well but also likes lots of other activities, and tbh I'd rather she kept up a good variety of things instead of concentrating solely on swimming, so I'd only encourage her to follow ds' example if it was what she desperately wanted to do
I hope your dd continues to enjoy herself
ps this morning ds' set was 1500m flat out, 800m flat out, 400IM flat out, 200IM flat out followed by 100m sprint
- makes me feel exhausted just thinking about it 