too many people do it and its perfectly fine . its not a wise idea to hold an elderly person for the greed of green card . let her do what makes her happy at her old age . my neighbors mom did same , her son got her green card and she couldn't survive first year . eventually she is now on multiple visit visa and make visit at her will not by force . . never overstay follow rules and you will be fine . personally im a 2 time dv winner , i decline my first dv in 2018 and now im in the US enjoying life with zero issue .