ey!
You got it right!
she's overwatered, no need to look any further.
In the video you can see the soil is really wet and the try still has some water in it.
I suggest you take out that water from the tray.
Don't water again until top part of the soil is dry to touch, do the old finger till first knuckle test and then continue to water but with less amount.
To complete dry might take a couple of days.
Overwatering is one of the silliest mistakes but can ruin everything.
It can stunt the plants growth for a few days, lack of oxygen in the roots can cause root rot.
Soggy soil can extract pests as well. It's easier to add less water and up the amount as need than to over do it.
Hope this helped.
Good luck and happy growing!