Tax question post divorce

My husband went through a long divorce and they are finally able to file back taxes. There is one past year they have to file married jointly  my husband did all the leg work and did everything to get the taxes done and now she’s refusing to sign unless her name is what’s listed on the return.  She is untrustworthy and manipulative and we do not trust her to not try something. What kind of an attorney do we need to talk to? Or what can we do? Our current attorney that did the divorce has a problem communicating so we don’t know what to do and we are nearing another deadline and more penalties