The established expectation is "water isn't much fun". Another "issue" (don't know where you are located) may be water is coolng off which will add to the problem. You can't force a dog to "like" water if things have been going badly (see bold comments).
......when I scold her she just cowers down to me and just shuts down. I've tried doing "fun bumpers" with her and it is still not working. I think I started the problem by throwing my own marks so I got a buddy to throw them and we have been doing that for about a month now and nothing has changed. Also we don't let her come back without having a bumper in her mouth...........Any suggestions would be a big help.