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African Violets need all their needs met to bloom. The number one reason for not blooming is inadequate light. East exposure best with north exposure next best and light must be indirect. Plant wants to be slightly root bound, fertilize and water from the bottom.

Your plant has produced a seed pod.
This article has more information.

https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-seeds.htm

I would not use the Neem Oil on the African violets for PM. Instead I would use a product called Green Cure. It is an earth friendly product that really gets after PM when applied at the cure rate listed on the label. It can be purchased on-line at places such as Planet Natural or Amazon.com.

Check the label of the potting mix that you used.
African Violets do well with a light feeding at every watering. Over fertilizing can lead to lack of flowering.
See how the plants do with just the soil.

This article will refresh you on the care requirements.

https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm

This is actually normal and is no reason to worry. The older stems at the bottom of the plant will die and fall off, leaving room for new ones to grow in their place.

Make sure you are not watering the leaves of your plant directly, they don't like that. Water only the soil.

African Violets need plenty of light but they do not like direct sunlight.

This article will give you some additional tips on caring for your mother's African Violet:

https://www.gardeningknowhow.com/houseplants/african-violet/yellow-african-violet-leaves.htm

To me it looks like one of two things. It could either be a watering issue, or too much light.
These prefer filtered light, and not too much of it. Also it is best to water them, only, from the bottom tray.

Here is an article for more information: https://www.gardeningknowhow.com/houseplants/african-violet/african-violet-care.htm