You might have a look here for a few thoughts that might help:
https://www.susans.org/forums/index.php/topic,180045.msg1658077.html#msg1658077I personally also like the twin explanation... people will be like their male/female twin... with still the same sense of humour etc...
Some people explain their feelings in a letter and talk about it later...
well a talk instead has the advantage of being more flexible...
and, well, you might look for support groups...
I think people are different if its a one to one situation, especially with people they know.
On the other hand it might give her a feeling of being included .
So its up to you...
Well a possibility might be to talk about what fears are behind controlling behaviour...
maybe they don't want to talk about if first...
maybe some kind of reassurance would be possible...
hugs