How likely is to be elegible for a waiver if you have 5 years ban

Back on 2015 my daughter was removed upon arrival at a U.S. port of entry because she was found inadmissible as she violated her norinmigrant visa. She has a ban for entering the country for 5 years. I wonder how likely is for her to be elegible for a waiver and if it is worth the effort to pursue this.
 
Probably not worth the effort in year 2 of a 5-yr ban. She'd be seen by any CO as another visa violation risk.
 
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