You could setup a filter that forwards those emails to her or viceversa.

CS2 is Counter Strike 2. Cities: Skylines 2 is C:S2

Google constantly does this unethical bundling of features with privacy switches. I remember when I used to use Android that turning off Location History meant you couldn’t save your home and work address on Google Maps.

Unless I’m missing something, this isn’t a messaging standard like RCS or XMPP. This is just a way to do E2EE messaging. Just like Signal and Whatsapp both use the Signal protocol for E2EE messaging but are completely siloed networks, MLS would be much the same.