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:

https://www.cid.army.mil/assets/docs/foia/ReadingRoom/Lavena%20Johnson%202005.pdf

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