Thank you for trying - I deeply appreciate help on this.
I did consider nematodes, but could not find symptoms that matched. She still has the bump, but ate today and has otherwise seemed normal. Her leg/foot is back to normal. But still I'm really worried about her, the bump is there and I don't want her to go through it again.

If anyone knows any more info, like personal experience, with nematodes in ACFs I'd so love to hear about the symptoms.

But above all I wish her a recovery, and good health to all of you and your little friends
-David