AIBU to offer support

[twinkie81]

My boss is really struggling with stress right now. She is in the nicest possible way a control freak, she doesn't really trust anyone to do anything and so puts herself under a huge amount of pressure trying to control everything around her. She works ridiculous hours and finds it very hard to switch off. Everyone is suffering as her mood is terrible this week.
I understand her, as the control freak tendencies are ones that we share.
We have always got on very well. I have drafted an email just telling her that I understand and offering my support if she needs it, but I've lost the bottle to send it in case she is offended.
Should I go ahead and send it or just confine it to the recycle bin and let her get on with it?

Send it

How have you worded it, would she find it undermining to her position as Manager?

I wouldn't, she might think that her team are losing faith in her and make her worse.

Worded it that she's amazing at her job (which she is) but that she puts the work before herself and her own welfare. She would sacrifice anything personally to put work first.
We've known each other 13 years and I've always been the one to tell her when enough is enough. She takes it well, I usually get referred to as Mum despite being 10 years younger. She knows I was completely behind her recent promotion and have complete faith in what she does.