Should i help mediate/listen and give my opinions/insights?

So my brothers girlfriend now wants to visit him in the hospital where he's been residing for the past few days due to his outburst/realization. (Read my previous post, gist is though he's been having a sort of mental struggle at this point in his life.) Thing is she never answered our calls when his outbursts where happening, she also didn't really call to us find out the situation or how he was doing at the beginning. My mom's now angry at Her for not helping and sticking by him or just letting us know stuff. My brother ended up breaking up with her during his episodes/outbursts, it was for her not seeing or feeling what he did with all this crazy god and purpose stuff. I called her to let her know he's doing better and that he's safe, She told me though that she didnt contact us because she was scarred and thought he didn't want to see her again because the way he talked to her in those moments in the breakup during his episodes. They both still love each other, it's just they're having some problems and they've been together for 4-5+ years building their lives with each other, working together and such.

Thing is obviously she's kinda scared to visit him, but things need to be done. I was thinking if I should go and help mediate or something of the sort...its just cause I want the best for my brother obviously, but its just like I don't feel like it should all end the way it did with his episodic breakup and her just leaving, they built together for awhile, and they had plans and such. Though I am younger than him, I don't believe I can't shine a light on a thing or two, or just bring in my insight/how I see things.

Should I reach out and tell her if she wants I could come along and mediate and just help the figure out the situation? Or is that butting-in?

Also maybe I didn't mention it, but hes doing a lot better now.