daycare and aggression

Is the dog fearful or actually aggressive? In the right daycare with the right people it can help with a dog that is fearful (a lot of fearful dogs act aggressively to try and scare the other dogs away).

It *sounds* like her issue is being on leash, in which case going to dog daycare probably would not help much. Being on a leash and off a leash are very, very different to dogs. Your best way to get a good opinion would be to have a behaviorist evaluate her for you and help with how to procede from there.

At the daycare I work at we actually have several dogs who on leash appear very aggressive, off leash in the daycare they are very friendly and playful with the other dogs.