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Grasses that fail to flower in spite of good growing sites may be exposed to excess nitrogen. This promotes growth of foliage and minimizes formation of plumes. To correct an issue of no plumes on ornamental grass due to too much nitrogen, offset it with some high phosphorous fertilizer. Bone meal is a good fertilizer in this case.

Grasses that are cut back at the wrong time of the year will also fail to flower. For most ornamental grasses, the best time for cutting is in spring, but in milder climates, you may also prune in fall. Do not cut them back in summer, as the forming flower stalks will be removed.

Another factor that prevents flowering is age. Very young starts will not flower until mature. This may be up to three years after planting. Old plants can also fail to form plumes. Much like any perennial plant, flowering slows down as the crown gets old. You may also find that the plant is thinner and grows fewer blades. The solution is division early in the season.

As long as it is still green, it should recover just fine. If, however, the plant show signs of browning (or yelowing), I would prune it out. Thes plants are normally pruned back to the ground each year anyway, so if you have to resort to this, it will not hurt the plant.

This article will give you guidelines on how to plant your pampas grass:

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm

Basically you will want to plant your clumps of pampas grass at least 6" apart.

Happy gardening!

This article should help with getting rid of pampas grass: https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/pampas-grass-removal.htm

This could be an issue with to much Nitrogen in the soil. This will cause lush greens and little or not flowering.
Adding Phosphorous will help with flowering and Bone Meal is a good way to dot this.

Here are some links with more information.

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

There can be a few reasons for your plant loss. Drought can greatly effect Pampas Grass, and it does need water during dry times.

The plant sometimes will die off from the center if it is to tightly growing together.

Also I should mention that we had numerous reports this spring and summer of Pampas Grass struggling after the long harsh winter the nearly the entire US suffered. This certainly may be some of the effects you are also seeing.

Here is a link to refresh you on the care requirements. Pruning back may help rejuvenate you plants.

https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm