Hey guys looking for some advice on what to do with my harlequin. She's a full sized older adult with a wound on her tail that is pretty severe. There is no fuzziness or evidence of infection, but it's severe enough that her tail is at an angle and it looks pretty unpleasant. Oddly, she's eating great and doesn't seem to have any trouble swimming at all (even though she's had this wound for at least a couple weeks.)
I've increased water changes and am treating with melafix and seachem stress guard but I'm not sure if there is anything else I should do.
Back a few steps: I was out of town for about two weeks and so I suspect while the fish weren't being fed they got aggressive with each other. While I haven't had problems with leaving my tank for up to this long before, (usually the shrimp become vacation feeders

) this time I lost a dwarf gourami (literally lost, no where to be found. I would suspect
it turned into a vacation feeder but there was no skeleton. Perhaps the nerites took care of it?)
Anyway, since it looks like physical damage rather than illness and I've not seen any further aggression from the other fish, I hesitate to separate her from the rest of her school. I feel like she'd probably be more stressed in a quarantine tank and it would do more harm than good.
Any advice?