Yes. My wife is a paramedic. I've been in emergency services for 12 years. We go to couples therapy to help keep the stress from work infecting our relationship.
Therapy is generally a good thing, but it's gotta be her decision too. You can't force therapy on someone.
People in the ER see and experience stuff every day that humans are not supposed to see with any regularity. I highly suggest therapy for anyone, especially those of us in emergency services.