I'm sorry, but that plant looks like a goner.

Fortunately, you can get another ...

You can try to root your sucker in water - only submerge the bottom part of the stem - it may survive or not - probably not. You already have 3 of the same - time to purchase a different color.

It happens to all of us - but if you catch it up early the chance of success is much better - you just reroot the crown. If you repot them more often - like every 6 months lowering the plant down a bit each time - they do not develop a trunk - and they perform better. And you reduce the chance of a root rot. Though... no guarantee. Root rot can hit the biggest and healthiest plants just so.

Not sure what you're doing w/ rocks on top of violets, that's for succulent, not violets.

Have you read up on violet care? It's pretty specific care & hi maintenance, which it would seem you're not aware of. There is or was an AV forum here too, maybe ask there.

PS: Sorry, I see it's cross-posted to AV forum too, after I posted.

Southern window is too intense for African violets unless it's filtered. They also like to dry out some between waterings. You can't really put them on a schedule to water, because, if they stay too wet, they will rot. They can't be treated like just any other house plant. They have a reputation for a reason. Also, what kind of dirt are they in? Regular potting soil is too dense for them and holds too much water, which will lead to rot over time.

Karen-

The "rocks" on top are just perlite-the plants are in a 50/50 mix of AV soil and perlite.

I have been researching Violet care. My other violets seem to be doing better so far. They already look much better than they did a couple months ago.

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Vikki-

They used to be in a much darker area before I moved them after receiving advice from a previous topic I posted. They look much better now than they did back then. Also when I mentioned the "once to twice per week" it wasn't intended to be an official schedule; just a general estimate of when I water based on the moisture of the soil. The mix I'm using is pretty airy and dries easily.

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Regarding the sucker-I've placed it over a jar of water with a sheet of foil on top. About 1mm of the stem is touching the water. I'll update if anything happens. Thanks again!

EDIT: added pictures. I also cut two leaves and put them in a similar setup to see if they can root.

a bit late to the party, but with stem rot - cut off all the brown stuff, and then some more... i've not lost a plant from chopping off too much, but plenty from trying not to...

Update:

GOOD NEWS!!!

The plant I cut AND both leaves have begun to root!

Plant in water:

Out of water pic:

New leaves have begun to grow:

Leaf cuttings:

At what point should I pot them up into soil? I’m planning to pot the plant separately from both leaves (both leaves will be potted in one pot).

Thanks in advance!