Can you please post some photos?
How long ago was she injured (how many days)?
Where are you located?
A smell like rotten meat would be infection.
Flush the wound really well with chlorhexidine or betadine. Hen healer has it's place, but I would not use it for this type of wound. If you can use Neosporin or Vetericyn, those would be better.
If you have vet care, that is best, but I agree, getting some antibiotics is a good idea.
I would start asap. If you have a Tractor Supply look for Fish Mox (Amoxicillin) and get that. If they don't have Amoxicillin, look in their refrigerated section and get Procaine Penicillin G along with some 20 gauge needles and the smallest syringes they carry.
Personally I would not wrap the wound, just keep it moist with your spray.
Tell us more about her spewing mucous-like stuff from her beak? It sounds like she's got more problems. I would see if I could get fluids into her, but the mucous is very concerning.