Maybird, welcome to the forum...
You need to take your cockatiel's wing condition very seriously, the main and emergent reason being because her wing is actively bleeding whenever it is bumped on something. THIS INDICATES AN OPEN WOUND OR MORE URGENTLY, A DAMAGED BLOOD FEATHER!!! Either way she needs to get to ONLY a Certified Avian Vet immediately, not only because SHE IS IN PAIN, SHE'S JUST NOT SHOWING IT, THAT'S WHAT BIRDS DO, but also because:
-If it's a damaged blood-feather it will never stop bleeding unless it is pulled out of the bone by a Certified Avian Vet, AND IF DAMAGED BADLY ENOUGH, SHE WILL SUDDENLY START BLEEDING TO DEATH, WHICH ONLY TAKES A FEW MINUTES FOR A COCKATIEL TO DO THROUGH A BLOOD FEATHER.
-If it's an open wound that keeps bleeding then it's going to become very infected, which will eventually make her very sick from sepsis...
Simply "clipping her wings so she can't fly" is not a proper solution to this problem at all, your bird is actively bleeding whenever her wing is banged-off of something. I've seen this before many times, and it's not a "broken wing", it's usually a DAMAGED BLOOD FEATHER, which must be pulled with a special tool by a Certified Avian Vet only, who knows what they are doing...Eventually this could kill her, and she is no-doubt suffering as well. Please, I understand the money issue, I really do, but this needs addressed immediately, it's irresponsible as a bird-owner not to get her to a Certified Avian Vet immediately for this...