Blood Cough led to death (Reason Unknown

Sir, This is the problem faced by my sister, on Feb 2025 we tested and tb is negative doctor told it may be pneumonia in July 25 and she had pain in left side of shoulder,hand she cough and she also have chest tightening and After 15 somedays she spill blood cough.also in vomit she spill Blood clots. We visit hospital immediate & everything is normal in reports. We tested CT scan there is something and doctor suggested for Bronchoscopy and we proceeded after that test she went to ICU and doctor told us during test their is blood leakage inside the lungs and they removed that immediately and some clots been removed and we sent that samples for test in 3 places and everything is normal and after that day her oxygen level is risen to 6 we have been sent to other hospital and they also done the same process but no progress and sent her to ICU which pump air in and take it out also.evening she lift her chest up and down in ICU,sent to Ventilator morning and died. reports attached.