The Kraken:Life lesson #666 - The man is ALWAYS wrong.
A hint, she's your girlfriend.
Some advice, let her dive in what she wants to dive if you want her to stay your girlfriend.
If she dives in something other than the 7mm and gets cold, I can assure you that you will never hear the end of it. It is just the nature of that sort of thing.
An observation, it is infinitely easier to cool off in water than it is to warm up. If whe gets warm, all she has to do is open the neck a wee bit and let in some cool water.
If she gets cold, well, you know the rest of the story.
the K
Kraken, you are a wise man
My husband learned one lesson very early on in our diving - never get between a woman and her neoprene! I like to have the option to add or subtract based on how I feel that day. I have a full 3mm, full 1mm and core warmer and they all come with me. He can take whatever cameras he wants, and I take whatever wetsuit or suits I want.