The fibrous fruits and greens can be harder to grind and digest, so I would have grit available to her in case she needs it. There may be some already in her gizzard from before she was injured which has held her over. Very hard to say how long it lasts since it depends on it's size, what it's actually made up of, and what she's eating. My soil is very sandy with very little rock of adequate size for grit, so I always have it out in separate feeders. Impacted gizzards are not good to deal with, so I'd rather do all I can to try to prevent it. I would try to make sure she's getting adequate protein and not too watered down with too much of the other stuff, but making sure she eats is important, and the 20% all flock is good, and good that she's eating it willingly. I feed all flock all year round, I just have oystershell for calcium available in separate feeders (as well as some for grit) for those that need it. I have 4 roosters and very mixed ages of birds, some fairly old, so that works better for me, and those that don't need the extra calcium don't have to eat it.
