You could simply point out that it is always worth a try, and ask her if she actually wants to try to control and get past the anger issues. Point out that anything to make her happier has got to worth a try? And a happier relationship too.

Also, I'd like the mention, is she on hormones? Those can have horrible side-effects like depression. I wonder if that may be contributing to her apathy towards trying therapy? Maybe its worth mentioning it, when everything is calm.

I do have to say tho, that sometimes therapy just doesn't work. A bad therapist, or simply not in the right mindset for therapy. I tried it once, and it actually made me worse, because facing things made me relive everything and get more angry.

I hope you guys are able to sort things out. Hugs