I am going off topic here to answer this question with a little more depth.
Is she listed in the credits? If not can they use the flashbacks without listing her? It's a money thing...you don't get royalties if you're not listed in the credits.
Nope she isn't in the credits for this episode, and yes they can use her in flashbacks without listing her in the credits as long as the flashbacks that they are using are from previous episodes, if they decided to do a flashback of her in which she had to come in and film a part that has never been seen then they would then give her credit for that. -- Most actors/actresses have it put in their contract regarding their image used in flashbacks as well as in repeat episodes, most times it is one set amount for so many either eps or uses of the image, example they say we will give you [insert amount] for using your image or scene six times and if we go over that then you would be paid [insert amount] for the extra usages. Same analogy applies for repeated eps. The repeated eps are done because of syndication to other networks, DVD's, ect.
Another example one actress on another show/network at one point had it put in her contract that if she was no longer on the show that she would be paid a certain amount just to have her characters
picture used in any given episode, which it rarely was after she left the show, this also included any episode in which her image would also be used in flashback, which was rarely as well after she left, now they did do a flashback on said show but the actress was not paid for it because they had used parts of previous eps that used a look alike stunt double. Nifty little loopholes if you can get them.
But as to Jorja, again no she doesn't have to be listed in the credits via print or on the screen where you see the names flash, or even in the credits that run after the episode has ended. Usually this only happens if it is in their contract or an amendment to it. A good example she was shown in a video in "Leave Out All The Rest" but she was not credited in that episode officially.
Hope this helps.
Going back on topic now.