My question involves bankruptcy in the state of: NY
Chapter 7 lawyer wants 1.5K additional to sue IRS. Debt from 2013, filed in 2014.
I don't fully understand the strategy, except she said it's to insure against future IRS collection efforts.
My concerns: one, is this kosher; and two, what are the unintended consequences this could have between me and the IRS in the future?

But certainly there are legitimate adversary actions against the IRS that can be taken in bankruptcy. Whether what you lawyer wants to do is actually something that might succeed is something I cannot tell you without the details of what she has in mind and the details of your situation. The IRS is involved in litigation all the time — as I recall the IRS has the largest number of lawyers of any federal civilian agency other than the Department of Justice — and there is a special court devoted to just hearing income, estate, and gift tax cases, the U.S. Tax Court, which gives you a pretty good idea of just how much tax litigation there is. (Which is good for my practice.) The IRS is a huge organization and one adversary hearing in a bankruptcy isn't something that will create some kind of grudge against you by the IRS later on. If you have a reasonable shot at succeeding with the action your lawyer has in mind and the benefit will justify the cost to do it then go for it. You don't need to worry about somehow angering the IRS.