Definitely teach her a 'head down' cue. When you go to take the bridle off, you could also loosen it one or two holes, so you don't accidentally pinch, or pull hairs on her head...some horses HATE that! I would teach her the head down cue, then start using the halter, with the throat snap undone, and remove it the same way you would a bridle; chances are she may argue about this too, as it may just be an 'anticipation' thing. Have her put her head down for you, and slip one ear out of the halter...if she raises her head, just leave it there, and ask for another 'head down'. Slip the halter back over her ear, and start over. When she is good with this, then put her bridle on, and start out the same way...remove one ear, put it back, until she stops anticipating. Even if she is reacting out of a painful memory, the key is to STOP her anticipatory response, as that CAN hurt her.
For the "Whoa" you could start teaching her a one rein stop; an advantage of this is that with all the bending you do, you can really get a soft supple horse. Don't yoink the rein back to far on the first times, just take the slack out of it, and bring it to your hip, and leave it there until she 1)stops 2) gives to the bit pressure.
For the legs I would work with a carrot stick on this one, so you have control over both her face, and her feet. Just start rubbing up and down each leg, until she stops moving or picking it up; if she picks it up, just keep rubbing, until she sets it back down. Chances are, whoever taught her how to lift her feet, did in in such a manner that now she is afraid NOT to lift them. Desensitize her to touch, and teach her that every touch on the leg does not mean "lift". When you do go to pick up a foot, I would teach her a cue word, such as "give it" or "Up", something like that. When she is used to you touching her on all four legs with the carrot stick, and is not lifting, or pulling away, then start proceeding to touch her with your hand. Try to not remove pressure until she stands.