Look man, it's easy to read charged headlines and be angry.
I did the same thing and went digging.
Here's the FOIA of the investigative conclusion:
Beware its like 56k d/l speeds.
Things to see:
She joked about suicide
Was vocal about a recent break up
Confided in close friends about a recent diagnosis(redacted in the FOIA but likely an STI)
The first people to respond was a myriad of random, unaffiliated people across more than one branch of military. All of whom were questioned.
I don't feel like going down this rabbit hole again. The write up seems to be thorough for what was seemingly a suicide. She more then likely killed herself