Mike,
Additionally to what Maxx has written. ...Her mum will see the happiness in Jessica's face and in her general demina, and that's what mum will want for Jessica ...to be ''Happy'' She'll obviously be sad at the thought of her moving so far away from her family in China, but knowing she has found a good man that she will be happy with, will outweigh her sadness. Try to assure her that Jessica will still come to visit the family as often as it is possible.
Don't show that your nervous, show a her you are a confident, but a respectful guy, which i think you are anyway, then just swim with the flow...
It's Jessica, ...that is going to be your trump card Mike, both at the meeting, and every time she sees her mum. It's going to be that BIG SMILE across her face that tells mum she's doing the right thing and that your a ''Good Man'' .....So, ...One more thing to cross of your list ...hahaha!!
David....