Child support..Need A Nevada attorney?

My wifes ex husband never paid child support ordered in Minnesota. He just moved from state to state and currently reside in Nevada.This has went on for 26 years, and with interest, will be well over 100k She has the docmentation and has contacted 2-3 Reno lawyers who have never responded back. He does have the ests to pay this..Does anybody have any ideas how to get an attorney to collect this? PS the kids are grown, she worked 2 jobs for years to support them, and when she tried to pusue it through child support state agencies, was basically given the run around. Help please