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It must get too warm for your elderberry. The foliage stays dark in cool climates. In warmer months, the foliage is mainly green.

It sounds like you have all the cultural needs. Elderberries don't normally need much fertilizer, but since yours isn't flowering, next spring apply a slow release 10-10-10 fertilizer. You might also consider having your soil tested. There may be something amiss. You can enrich the soil with compost or manure right now. Make sure the container is very well draining as elderberries do not like wet feet. They also prefer cool and moist to hot and dry, which you may experience in Texas.

Pruning will benefit the shrub as the older canes are less productive. These articles should help:

https://www.gardeningknowhow.com/edible/fruits/elderberry/pruning-an-elderberry.htm

https://www.gardeningknowhow.com/edible/fruits/elderberry/elderberry-bush-varieties.htm

https://extension.unh.edu/blog/2020/08/what-best-way-grow-elderberries

http://www.hort.cornell.edu/fruit/mfruit/elderberries.html

The problem is you didn't get the chance to wash off insects and eggs before drying and pick out unripe or undesirable fruit. Plus they likely were overripe before drying on the vine and could be spoiled or moldy. Also, if they were sundried properly, you would bring them in at night to prevent moisture from condensing on the surface. In short, no preparation controls were utilized.

I would consider them a lost cause this time.

http://store.msuextension.org/publications/HomeHealthandFamily/MT200909HR.pdf

https://www.uvm.edu/sites/default/files/media/ElderberryGuideComplete.pdf