Barking is a very difficult habit to deal with as it is very reinforcing, bringing in another dog at this point, the new dog is likely to pick up the howling/barking habit reinforcing each other's habit. The suggestions of the others that you should check your daughters routine. Our children go through phases in their lives, and their personalities are in flux as they are growing, our Hav's are a sensitive breed and some are needy. You and your daughter might sit down and talk about what might be different...is she really excited before scoccer, or busy getting ready, does she make it a big deal, let her have an active part in solving the barking. In the mean time if your dog is in a crate move it to a room that is not close to your neighbor, also if you have an inside room away from the windows that is better still. Try to get your pup into a room that will mask any howling or barking. Sometimes you can ask your neighbors to let you have time to solve this, but some neighbors are not reasonable. I know personally how hard it is when neighbors complain, my Lhasa years ago was a barker and I lived in a hilly area so any barking bounced and ecoed, the police can out twice. I managed to train him not to bark...today he does not bark like a normal Lhasa, he barks seldom. I regret that I had to stop the barking quickly...he did not bark while I was gone he would alert at all sounds at night, so I spent two weeks with a spray bottle and no sleep. A year latter I found out it was another dog down in the canyon that was causing all the problems...so I do undersand desperation. Hope you can get this solved without too much stress.
Robbie, Boo Boo, Yogi, and Misty's human.
Poohkey miss you, monkey.