The sentence was 15 years to life, implying that in order for her to get out she will need to be paroled. She won’t get out automatically. The judge’s statements are on the record now so it is very unlikely, even if she is a model prisoner, that they will grant her parole in 15 years. Probably more like 20-25.
I feel for the father of the boyfriend. While clearly grieving for his son, he made a statement that he didn’t want her in jail for life, because it’s not like it would fix anything.