He isn't going to be convicted twice for the same murder. I think they probably do too, but you said earlier the robbery was a separate charge which is why I replied that it wasn't.
If there was a robbery inside or outside the Safeway, then felony murder with a robbery qualifier wouldn't be on the table. The homicide has to happen in the commission of the underlying felony, meaning she would have had to be killed during the robbery, and we know she wasn't killed inside the Safeway or in the parking lot. She is believed to have been killed at home, so if the felony murder theory holds, then that means she was robbed at home just before being killed there.
Once the perpetrator leaves the scene of the underlying felony, the murder cannot be considered to have been committed "in the commission" of the felony.
BBM. How could they possibly prove the robbery took place in her home if she wasn't found there and neither was PF?