It sounds like she is getting progressively sensitized to dogs being 'in her space'. No dog starts out like a jerk, but when they are uncomfortable with something that another dog is doing, they only have so many ways of communicating that without growling, barking or biting! I think that bulldogs (english and french) have an especially momentous task in canine communication because of their unusual faces, naturally stiff postures and stumpy tails. Facial expressions and body-language that are very easy to pick out in breeds like a chihuahua, a greyhound or a pitbull like a wagging tail, a fleeting lift of the lip or a 'stress smile' don't come as easily to a bulldog.
This makes their body language very subtle and different for dogs to interpret. Its very likely (I pretty much guarantee it) that if you could put a speech bubble above her head when she is exhibiting these 'bully' behaviors, what she is actually saying is
"This is the sixth time I'm gonna say it; give me some space here!!!"
For starters, I would skip the dog park and daycare. For now, at least. She's clearly not having a good time there if she is constantly having to tell dogs so clearly to back the heck off. If you do need outside care for her while you are working or taking a trip, you might do better to hire a dog walker-- Someone who has a small group of mellow, mannerly dogs who will not be too intrusive or offensive around her.
I still think it would be a good idea to consult with a trainer about this, as at times she will probably have to tolerate other dogs in close proximity-- In the lobby of the vet or the groomer, or if you have doggy guests visiting. This should be a fairly straightforward problem to clear up; she just needs to be counter-conditioned to the immediate presence of dogs so that she feels relaxed and at ease around them. Look for a trainer who is versed in positive reinforcement techniques-- Choking, shouting or zapping are not bound to make her keen on other dogs.
I would peruse these stickies:
http://www.dogforum.com/training-behavior-stickies/dogs-social-behaviour-13482/
http://www.dogforum.com/training-behavior-stickies/calming-signals-10084/
http://www.dogforum.com/training-behavior-stickies/growling-86338/
And, informed on this reading, find a trainer who will help her to feel better, not worse, about other dogs. My own little guy is very much like this in his older age. I strive for a balance of keeping him sane and safe, but also respecting his 'dog sense'. He's an 11 year-old pomeranian with femurs the thickness of pencils. Of course he's not going to greet an exuberant, pushy labrador puppy with open arms (er, paws)! I wish I had some web links handy for resources on crabby dogs but my mind is just blank at the moment
