I think it depends on whether the testimony you could potentially give would be truthful, for one thing. And whether she is going directly from jail to inpatient treatment would be another.
If she is to succeed on parole she needs to give this every ounce of effort in her being. I worked in law enforcement for many years, and I've often seen addicts who want "one more chance" fail when they went home rather than directly to treatment. You can't fix her, and after being incarcerated most of her life a structured environment, like a sober living facility, might be what she needs to adjust to a life of freedom.
The deaths in the family obviously are unfortunate, but tragedies will happen in everyone's life. Circumstances don't make anyone drink, or use--the addiction is what causes that. If she does not get a very strong foothold in recovery now, she stands a good chance of blowing it again, maybe with disastrous consequences.