Like I said in a previous response to you, removal is definitely on the list for unlawful voting. It is just a separate proceeding from the criminal prosecution. If prison time is warranted for a crime, time is typically served before removal proceedings are initiated.

Here is a case where a green card holder was being deported when, at least according to her, she mistakenly believed she was allowed to vote when she could not: https://www.nbcnews.com/nightly-news/peru-native-who-voted-illegally-two-u-s-elections-now-n746721

If her account is true, that looks like a lot of ignorance on both sides to me, not necessarily malice or gross stupidity.