my sister has them really bad on her roses and other plants picking the leaves off is not a option (wont be any leaves left)

is there any way to get rid of them

Ants, Texas Leaf Cutting
Aggressive ants that strip the foliage of plant and take it into large underground nests where the organic matter is composted in order to grow a fungus which is used as their primary food source. Control is difficult. Biodiversity helps, and keeping all bare soil helps but drenching the mounds with citrus-based products is the best method to kill the ants. Applications of beneficial insects also help.

This information was taken from this website.

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Sandi
Texas Certified Nursery Professional
Texas Master Naturalist
Organic gardener
Tree-Hugger
Native Texan