Is the ulcer healed over or is it still picking up the yellow flouresin dye?
How long have you been using the flurbiprofen and neo/poly/dex together?
Have any surgeries been performed?
Did your vet check her tear production to make sure she does not have "dry eyes?"
Do you keep an e collar on her so she can nor rub the eye?
The blood vessels are actually a good sign. It means it is healing.
They should definitely check the tear production because lack of teach production can cause corneal ulcers as well as impair the ability to heal.
www.VeterinaryPartner.com/Content.plx?P=A&A=1326 dry eye
Boxers can also have "bulgy" eyes and sometimes the eyelids do not close to completely cover the eyeball and therefore the corneal ulcer can dry out that way as well. That can delay healing too.
Most doctors do not use dex and flurbiprofen together because both drugs can delay corneal healing.
Drops penetrate the corneal epithelium better than ointment. The ointment can just sit on the surface.
If the whole cornea has a "blue haze" that is corneal edema or fluid in the cornea. At that point, I would add oral medications as well.
There may always be a small corneal scar.
Some ulcers need to be lightly debrided every week to remove the superficial "old dead" tissue. The eye can be numbed with a topical anesthetic and a cotton swab can be used to do the debriding.
Don't forget, they can rub the eye while you are in the shower or sleeping and then you have to start all over again.
www.VeterinaryPartner.com/Content.plx?P=A&A=554 corneal ulcers