I don't know about the legal ramifications but that so oversteps any normal boundaries ...... I'm so sorry you have to deal with this!
Originally Posted by peainthepod
The OP is in the middle of a divorce and there could be custody issues at stake. Consulting a lawyer is not litigious, but the only reasonable way to protect herself from her DH (who almost certainly has a lawyer of his own), and to ensure that she doesn't cross any legal lines while trying to keep this strange woman from nursing her child without her consent.